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The spike protein (red) mediates the coronavirus entry into host cells. It binds to the angiotensin converting enzyme 2 (blue) through its S1 subunit and then fuses viral and host membranes through the S2 subunits.

#140706396 - The spike protein (red) mediates the coronavirus entry into host..

Natural killer cells are a type of lymphocytes which destroy cancer cells and other altered cytotoxic granules.

#131853849 - Natural killer cells are a type of lymphocytes which destroy..

An activated T helper cell segregates the cytokines IL-4, IL-5, IL-6, IL-9, IL-10 and IL-13, leading to B cell antibody class switching, activation of cytotoxic T cells, and maximazing the bactericidal activity of phagocytes such as macrophages. Source: PDB entries 2B8U, 3VA2, 1ALU, 2H24, 3BPO

#126486974 - An activated T helper cell segregates the cytokines IL-4, IL-5,..

Multiple sclerosis is a demyelinating disease in which the insulating covers of nerve cells are damaged. Microglia cells (orange) attack the oligodendrocytes that form the insulating myelin sheath around neuron axons, leading to the destruction of the myelin sheath and to the loss of nerve function. Stock Photo

#126486972 - Multiple sclerosis is a demyelinating disease in which the insulating..

Cas9 uses CRISPR sequences to recognize and cleave specific strands of DNA. It is used as a specific and easy way to edit genes. Source: PDB entry 5b2r Stock Photo

#126486964 - Cas9 uses CRISPR sequences to recognize and cleave specific strands..

Immunologically active proteins on a T-cell. TCR (blue), CD-4 (light blue), CD-28 (dark blue), PD-1 (magenta), CTLA-4 (violet), Ca-channel (dark violet). The T-cell receptor, CD-4 and CD-28 activate T-cells, while PD-1 and CTLA-4 inhibit the activation of T-cells. Stock Photo

#110367853 - Immunologically active proteins on a T-cell. TCR (blue), CD-4..

Alzheimer's disease. Pathological Tau protein (red-orange) phosphorylation (yellow) leads to disintegration of microtubuli and aggregation to neurofibrillary tangles (orange) in a neuron axon. The transport of synaptic vesicles(spheres) is disrupted. Stock Photo

#109039320 - Alzheimers disease. Pathological Tau protein (red-orange) phosphorylation..

HIV-1 reverse transcriptase (RT) complexed with 30 nucleoside inhibitor (orange)

#106226107 - HIV-1 reverse transcriptase (RT) complexed with 30 nucleoside..

3d illustration of the ATP synthesis in a mitochondrion. ATP synthase couples ATP (red) synthesis from ADP and inorganic phosphate (orange) to a proton gradient (light points) created across the mitochondrial membrane during cellular respiration. Stock Photo

#103011538 - 3d illustration of the ATP synthesis in a mitochondrion. ATP..

Chimeric antigen receptor CARs are engineered cell receptors that allow T cells to recognize and attack cancer cells in a specific way. They are built by connecting several functional parts from different proteins. In this image a signal protein (ZAP70) is attached to the intracellular domain.

#100856934 - Chimeric antigen receptor CARs are engineered cell receptors..

PETase is a bacterial enzyme that breaks down PET-plastic to monomeric molecules. The whole bacterial degradation process yields terephtalic acid and ethylene glycol, which are environmentally harmless. Stock Photo

#100351893 - PETase is a bacterial enzyme that breaks down PET-plastic to..

Ras PRotein with GDP bound. Ras proteins are involved in transmitting signals within cells turning on genes involved in cell growth, differentiation and survival. Mutations in ras genes can lead to permanently activated proteins causing cells to subdivide without control, Stock Photo

#96791067 - Ras PRotein with GDP bound. Ras proteins are involved in transmitting..

Dendritic cell presenting an antigen to T-lymphocytes. The antigen is a peptide from a tumor cell, bacteria or virus. Dendritic cells present antigens to lymphocytes activating an immune response.

#92167301 - Dendritic cell presenting an antigen to T-lymphocytes. The..

Chimeric antigen receptor CARs are engineered cell receptors that allow T cells to recognize and attack cancer cells in a specific way. They are built by connecting several functional parts from different proteins. In this image a signal protein (ZAP70) is attached to the intracellular domain.

#91273462 - Chimeric antigen receptor CARs are engineered cell receptors..

Antibodies binding to a virus (norovirus) Antibodies identify and neutralize pathogens search as viri. Stock Photo

#84158371 - Antibodies binding to a virus (norovirus) Antibodies identify..

Tapeworm in human intestine

#81111217 - Tapeworm in human intestine

Intestine affected by Morbus Crohn

#75540366 - Intestine affected by Morbus Crohn

T-cell receptor in complex with the MHC class II-peptide complex. The antigen (light green) is a peptide from a tumor cell, bacteria or virus.

#60596993 - T-cell receptor in complex with the MHC class II-peptide complex...

Interaction between a T-lymphocyte (left) and a dendritic cell.endritic cells present antigens to lymphocytes through their membran bound MHC-molecules (orange).

#60596992 - Interaction between a T-lymphocyte (left) and a dendritic cell.endritic..

Dendritic cells and T-lymphocytes

#58987958 - Dendritic cells and T-lymphocytes

Interaction between a T-lymphocyte (left) and a dendritic cell. Stock Photo

#58987956 - Interaction between a T-lymphocyte (left) and a dendritic cell.

T-Lymphocytes attacking cancer cell.Natural killer cells are a type of lymphocytes which destroy cancer cells and other altered cells releasing cytotoxic granules. Stock Photo

#58218107 - T-Lymphocytes attacking cancer cell.Natural killer cells are..

Fat cells. White fat cells contain a large lipid droplet (yellow) and a nucleus (red) located in the periphery.

#56089315 - Fat cells. White fat cells contain a large lipid droplet (yellow)..

Macrophage engulfing bacteria (cocci).Macrophages engulf and digest cellular debris and pathogens.

#56089314 - Macrophage engulfing bacteria (cocci).Macrophages engulf and..

Macrophages approaching bacteria (bacilli). Macrophages engulf and digest cellular debris and pathogens.

#56089313 - Macrophages approaching bacteria (bacilli). Macrophages engulf..

A bacterial colony, bacilli Bacteria are prokaryotic microorganisms with a diversity of shapes ranging from spheres to rods and spirals.

#56089310 - A bacterial colony, bacilli Bacteria are prokaryotic microorganisms..

Dividing stem cells (mitosis) Stem cells are undifferentiated cells that can specialized through mitosis to many other cell types of multicellular organisms.

#55937357 - Dividing stem cells (mitosis) Stem cells are undifferentiated..

Cholesterol and atherosclerosis Stock Photo

#54940535 - Cholesterol and atherosclerosis

The beta amyloid peptid aggregates to amyloid plaques, Alzheimer disease Stock Photo

#54393704 - The beta amyloid peptid aggregates to amyloid plaques, Alzheimer..

LDL particle binds to the LDL receptor Stock Photo

#53761410 - LDL particle binds to the LDL receptor

insulin molecules Stock Photo

#53761228 - insulin molecules

Approximate size comparison of a LDL left and a HDL right particle

#53611198 - Approximate size comparison of a LDL left and a HDL right particle

Low lipoprotein particle LDL

#53611139 - Low lipoprotein particle LDL

Dust mites closeup

#52696885 - Dust mites closeup

Dust mites, their excretions are induce allergic reactions in humans

#52696884 - Dust mites, their excretions are induce allergic reactions in..

Dust mites

#52696882 - Dust mites

Zika virus Stock Photo

#52503740 - Zika virus

Cancer cell attacked by lymphocytes Stock Photo

#51270709 - Cancer cell attacked by lymphocytes

Insulin binding to the Insulin Receptor

#51270708 - Insulin binding to the Insulin Receptor

Fracking hydraulic facturing Stock Photo

#50937666 - Fracking hydraulic facturing

Neuron marked by fluorescence

#50617267 - Neuron marked by fluorescence

Antibodies binding to the virus influenza virus

#48716055 - Antibodies binding to the virus influenza virus

Stem Cells

#48716054 - Stem Cells

Peptic ulcer Stock Photo

#48510817 - Peptic ulcer

Antibodies binding to the influenza virus.

#47938115 - Antibodies binding to the influenza virus.

Alzheimer's disease, neurons with amyloid plaques

#46572772 - Alzheimers disease, neurons with amyloid plaques

Occurrence of polyps in the gastrointestinal tract Stock Photo

#44144466 - Occurrence of polyps in the gastrointestinal tract

Alzheimer disease, neurons with amyloid plaques

#44110954 - Alzheimer disease, neurons with amyloid plaques

3 phases of the Alzheimer disease Stock Photo

#44110953 - 3 phases of the Alzheimer disease

Neuron Network, pyramidal neurons in Ramon y Cajal's drawing style

#42557446 - Neuron Network, pyramidal neurons in Ramon y Cajals drawing style

Occurrence of ulcerative colitis in the gastrointestinal tract

#37827626 - Occurrence of ulcerative colitis in the gastrointestinal tract

Crohns disease, gastrointestinal tract

#36857774 - Crohns disease, gastrointestinal tract

Cancer cell attacked by lymphocytes Stock Photo

#36228183 - Cancer cell attacked by lymphocytes

Cancer cell attacked by lymphocytes Stock Photo

#36228182 - Cancer cell attacked by lymphocytes

Mold colony (Aspergillus)

#36228181 - Mold colony (Aspergillus)

View of the cell nucleus

#35712587 - View of the cell nucleus

Human lung affected by lung cancer

#35712585 - Human lung affected by lung cancer

Diverticula in the colon Stock Photo

#35489184 - Diverticula in the colon

Healthy intestine

#35034373 - Healthy intestine

Hay fever viruses

#35034371 - Hay fever viruses

In vitro fertilization Stock Photo

#35034368 - In vitro fertilization

Hay fever

#34996400 - Hay fever

Embryo, 4 cells

#34924681 - Embryo, 4 cells

EHEC bacteria

#34855502 - EHEC bacteria

Escherichia coli bacteria Stock Photo

#34855500 - Escherichia coli bacteria

Escherichia coli bacteria Stock Photo

#34855497 - Escherichia coli bacteria

Diverticula in the colon Stock Photo

#34780883 - Diverticula in the colon

Cancer cell attacked by lymphocytes Stock Photo

#34735824 - Cancer cell attacked by lymphocytes

Dividing cancer cells (proliferation)

#33976204 - Dividing cancer cells (proliferation)

4 phases of arteriosclerosis Stock Photo

#33628943 - 4 phases of arteriosclerosis

Fetus, 7 weeks Stock Photo

#33615296 - Fetus, 7 weeks

Fetus, 4 months

#33615294 - Fetus, 4 months

Borrelia bacteria in the blood Stock Photo

#33612247 - Borrelia bacteria in the blood

Bacteria infesting the villi of the intestinal mucosa Stock Photo

#33573411 - Bacteria infesting the villi of the intestinal mucosa

Bacteria, bacilli

#33573410 - Bacteria, bacilli

The asteroids Lutetia, Gasprah, Ida Stock Photo

#33573409 - The asteroids Lutetia, Gasprah, Ida

Asteroid approaching the earth

#33572962 - Asteroid approaching the earth

Arteriosclerosis. An artery wall thickens as a result of the acccumulation of lipids (in yellow) and calcium carbonate grains (in white).

#33572909 - Arteriosclerosis. An artery wall thickens as a result of the..

Antibody. Structure of antibody molecule to by by determined by X-Ray cristallography.

#33572906 - Antibody. Structure of antibody molecule to by by determined..

Antibodies binding to HI-viruses Stock Photo

#33572894 - Antibodies binding to HI-viruses

Dust mites. Dust mites eat flakes of shed human skin and other organic detritus.

#33572887 - Dust mites. Dust mites eat flakes of shed human skin and other..

Escherichia coli bacteria Stock Photo

#33527975 - Escherichia coli bacteria

Dust mites in a mattress Stock Photo

#33478885 - Dust mites in a mattress

Norovirus. Noroviruses are transmitted from person to peron and via contaminated water and food.

#33478612 - Norovirus. Noroviruses are transmitted from person to peron and..

migrating cancer cells. Cancer cells can migrate to other body tissues or organs building metastasis Stock Photo

#33379765 - migrating cancer cells. Cancer cells can migrate to other body..

Lymphocytes in the blood Stock Photo

#33379764 - Lymphocytes in the blood

Dust mites in a mattress Stock Photo

#31475677 - Dust mites in a mattress

Âµ-, delta-, kappa-opioid receptors display a role in modulating pain perception; opioid agonists are potent analgesics. Endogenous opioids are enkephalin, dynorphin, endorphin an. 3d rendering Stock Photo

#94453625 - Âµ-, delta-, kappa-opioid receptors display a role in modulating..

Chimeric antigen receptor CARs are engineered cell receptors that allow T cells to recognize and attack cancer cells in a specific way. Stock Photo

#91438122 - Chimeric antigen receptor CARs are engineered cell receptors..

Dendritic cell.Dendritic cells are antigen-presenting cells of the immune system.

#84155958 - Dendritic cell.Dendritic cells are antigen-presenting cells of..

Influenza viruses Stock Photo

#75608404 - Influenza viruses

T-cell receptor in complex with the MHC class II-peptide complex. The antigen (light green) is a peptide from a tumor cell, bacteria or virus.

#60596995 - T-cell receptor in complex with the MHC class II-peptide complex...

High lipoprotein particle HDL

#53611204 - High lipoprotein particle HDL

Endorphins, met-enkephalin

#44146747 - Endorphins, met-enkephalin

Multiresistant bacteria MRSA Stock Photo

#43527065 - Multiresistant bacteria MRSA

Pyramidal neuron

#39371628 - Pyramidal neuron

Asteroid approaching the earth

#34780888 - Asteroid approaching the earth

Natural killer cells provide rapid responses to virus infected cells and tumor cells. They act at around 3 days after infection.

#170316003 - Natural killer cells provide rapid responses to virus infected..

T-cell receptor in complex with the MHC class II-peptide complex. The antigen (light green) is a peptide from a tumor cell, bacteria or virus.

#60596994 - T-cell receptor in complex with the MHC class II-peptide complex...

A bacterial colony, bacilli Bacteria are prokaryotic microorganisms with a diversity of shapes ranging from spheres to rods and spirals.

#55935024 - A bacterial colony, bacilli Bacteria are prokaryotic microorganisms..

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123RF

About 123RF

Features

Blog

Tutorials

Services

Tools

Corporate+

123RF Partners Program

API Value-Added Reseller

Become an Affiliate

Promo Code

Policies

Legal

Licensing

Privacy Policy

Terms of Use

Cookie Policy - 123RF

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International

Русский язык

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Need help? Contact your dedicated Account Manager

@ 1 866 655 3733

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