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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

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...

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)..

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..

insulin molecules Stock Photo

#53761228 - insulin molecules

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

Insulin binding to the Insulin Receptor

#51270708 - Insulin binding to the Insulin Receptor

Neuron marked by fluorescence

#50617267 - Neuron marked by fluorescence

Stem Cells

#48716054 - Stem Cells

Peptic ulcer Stock Photo

#48510817 - Peptic ulcer

Alzheimers 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

Neuron Network, pyramidal neurons in Ramon y Cajals 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

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

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)

Fetus, 4 months

#33615294 - Fetus, 4 months

Borrelia bacteria in the blood Stock Photo

#33612247 - Borrelia bacteria in the blood

Bacteria, bacilli

#33573410 - Bacteria, bacilli

The asteroids Lutetia, Gasprah, Ida Stock Photo

#33573409 - The asteroids Lutetia, Gasprah, Ida

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

Intestine affected by Morbus Crohn

#75540366 - Intestine affected by Morbus Crohn

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

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

Fracking hydraulic facturing Stock Photo

#50937666 - Fracking hydraulic facturing

Antibodies binding to the influenza virus.

#47938115 - Antibodies binding to the influenza virus.

Pyramidal neuron

#39371628 - Pyramidal neuron

Fetus, 7 weeks Stock Photo

#33615296 - Fetus, 7 weeks

Asteroid approaching the earth

#33572962 - Asteroid approaching the earth

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

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

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..

Influenza viruses Stock Photo

#75608404 - Influenza viruses

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..

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..

Cholesterol and atherosclerosis Stock Photo

#54940535 - Cholesterol and atherosclerosis

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

Antibodies binding to the virus influenza virus

#48716055 - Antibodies binding to the virus influenza virus

Endorphins, met-enkephalin

#44146747 - Endorphins, met-enkephalin

3 phases of the Alzheimer disease Stock Photo

#44110953 - 3 phases of the Alzheimer disease

Cancer cell attacked by lymphocytes Stock Photo

#36228182 - Cancer cell attacked by lymphocytes

Bacteria infesting the villi of the intestinal mucosa Stock Photo

#33573411 - Bacteria infesting the villi of the intestinal mucosa

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..

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...

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...

Tuberculosis bacillus in the lungs Stock Photo

#55937358 - Tuberculosis bacillus in the lungs

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..

LDL particles in the blood stream

#54767868 - LDL particles in the blood stream

LDL particle binds to the LDL receptor Stock Photo

#53761410 - LDL particle binds to the LDL receptor

High lipoprotein particle HDL

#53611204 - High lipoprotein particle HDL

Multiresistant bacteria MRSA Stock Photo

#43527065 - Multiresistant bacteria MRSA

Pyramidal neurons

#39372112 - Pyramidal neurons

Mold colony on a carpet

#36228180 - Mold colony on a carpet

Human lung

#35712586 - Human lung

EHEC bacteria

#34855502 - EHEC bacteria

Asteroid approaching the earth

#34780888 - Asteroid approaching the earth

Structure of the DNA Stock Photo

#34780884 - Structure of the DNA

4 phases of arteriosclerosis Stock Photo

#33628943 - 4 phases of arteriosclerosis

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..

Two neurons Transmitting a signal Stock Photo

#33572895 - Two neurons Transmitting a signal

Brain cells. The main cell types of the brain: yellow: neurons; orange: astrocytes; gray: oligodendrocytes; white: microglia. Stock Photo

#33527977 - Brain cells. The main cell types of the brain: yellow: neurons;..

Myelin sheaths insulate the axon from electrical activity. This insulation increases the rate of transmission of signals, which springs from gap to gap.

#118554692 - Myelin sheaths insulate the axon from electrical activity. This..

Myelin sheaths insulate the axon from electrical activity. This insulation increases the rate of transmission of signals, which springs from gap to gap.

#118554691 - Myelin sheaths insulate the axon from electrical activity. This..

Oligodendrocytes form insulating myelin sheaths around neuron axons in the central nervous system. One oligodendrocyte can extend its processes to 50 axons. Myelin increases the impulse speed and decreases the capacitance of the axon membrane.

#118554689 - Oligodendrocytes form insulating myelin sheaths around neuron..

Bacterial dehalogenases remove halogen atoms from organic compounds. The one shown here is a reductive dehalogenase from PDB entry 4ur0. It uses a cobamide cofactor (orange) and iron-sulfur clusters to reduce the substrate. Dehalogenases may be used as a way to clean up areas polluted with halogenated compounds. Stock Photo

#118052366 - Bacterial dehalogenases remove halogen atoms from organic compounds...

RNA polymerase II transcribing DNA into RNA. The 4 RNA nucleotides AMP, CMP, GMP and UMP are highlighted. Stock Photo

#118052365 - RNA polymerase II transcribing DNA into RNA. The 4 RNA nucleotides..

RNA polymerase II transcribing DNA into RNA. It unwinds DNA strands (violet) and buids RNA (red) out of the nucleotides uridine, adenosine, cytidine and guanosine monophosphate.

#118052362 - RNA polymerase II transcribing DNA into RNA. It unwinds DNA strands..

A cell membrane in fish eye perspective. Receptors: opioid receptor, LDL receptor and acetyl choline receptor. Channel proteins: chloride channel and acetat permease. The glycolipids are depicted in bluish green.

#118052336 - A cell membrane in fish eye perspective. Receptors: opioid receptor,..

Structure of the influenza virus. On the surface of the virus: hemagglutinin (violet), neuraminidase (magenta) and the M2 proton channel (dark violet). M1 proteins build a capsid that encloses that encloses the ribonucleprotein particles with the viral genetic information. Each particle has an RNA polymerase complex (orange). Stock Photo

#118052308 - Structure of the influenza virus. On the surface of the virus:..

Chloride channels conduct chloride anions across cell membranes, regulating the electrical excitation of skeletal muscles and the flow of salt and water across epithelial barriers. They also play an importante role in regulation of pH, volume homeostasis, organic solute transport, cell migration, cell proliferation and differentiation.Genetic defects in Cl- channels underlie several familial muscle and kidney diseases.

#118052292 - Chloride channels conduct chloride anions across cell membranes,..

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123RF

About 123RF

Features

Blog

Tutorials

Services

Corporate+

123RF Partners Program

API Value-Added Reseller

Become an Affiliate

Policies

Legal

Licensing

Privacy Policy

Terms of Use

Cookie Policy

International

Русский язык

Português (PT)

Support

Need help? Contact your dedicated Account Manager

@ 1 866 655 3733

Contact

Support

Connect with Us

Follow us on Twitter

Join us on Facebook

Connect with us on Google+

Follow us on Pinterest

Follow us on Instagram