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    Illustration of synapse structure in cross section. — Stock Photo
    Illustration of synapse structure in cross section.
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Blue colored nerve cell on white background, digital illustration. — Stock Photo
    Blue colored nerve cell on white background, digital illustration.
    Medical illustration of human cell structure on dark background. — Stock Photo
    Medical illustration of human cell structure on dark background.
    Fat cells, computer illustration — Stock Photo
    Fat cells, computer illustration
    Digital illustration showing red blood cells, platelets, neutrophils, monocyte and lymphocytes in normal blood smear. — Stock Photo
    Digital illustration showing red blood cells, platelets, neutrophils, monocyte and lymphocytes in normal blood smear.
    Illustration of human nervous receptors on white background. — Stock Photo
    Illustration of human nervous receptors on white background.
    Skeletal muscle structure — Stock Photo
    Skeletal muscle structure
    Illustration of unfertilized human egg cell. — Stock Photo
    Illustration of unfertilized human egg cell.
    Abstract colored illustration of blue human nerve cell on light background. — Stock Photo
    Abstract colored illustration of blue human nerve cell on light background.
    Transparent cells on white background, digital illustration. — Stock Photo
    Transparent cells on white background, digital illustration.
    Pancreas tissue. Transmission electron micrograph (TEM) of part of the exocrine pancreas. Seen here are zymogen granules and cell nuclei. In the image the endoplasmic reticulum that fills the cytoplasm is clearly visible. — Stock Photo
    Pancreas tissue. Transmission electron micrograph (TEM) of part of the exocrine pancreas. Seen here are zymogen granules and cell nuclei. In the image the endoplasmic reticulum that fills the cytoplasm is clearly visible.
    Light micrograph of onion (Allium cepa) root tip cells undergoing mitosis (nuclear division). — Stock Photo
    Light micrograph of onion (Allium cepa) root tip cells undergoing mitosis (nuclear division).
    Animal cell with mitochondria, digital illustration. — Stock Photo
    Animal cell with mitochondria, digital illustration.
    Human cell, computer illustration — Stock Photo
    Human cell, computer illustration
    Caudate nucleus, computer illustration. — Stock Photo
    Caudate nucleus, computer illustration.
    Abstract animal cells, digital illustration. — Stock Photo
    Abstract animal cells, digital illustration.
    Genetic engineering, illustration. Synthetic small-ribonucleic acid (sRNA) being injected (needle tip at upper right) into the cell cytoplasm as part of a process of genetic engineering — Stock Photo
    Genetic engineering, illustration. Synthetic small-ribonucleic acid (sRNA) being injected (needle tip at upper right) into the cell cytoplasm as part of a process of genetic engineering
    3d illustration of a transparent and colourful protozoan. — Stock Photo
    3d illustration of a transparent and colourful protozoan.
    Medical illustration of human cell structure on dark background. — Stock Photo
    Medical illustration of human cell structure on dark background.
    Primary ovarian follicle — Stock Photo
    Primary ovarian follicle
    Conceptual 3d illustration of artificial insemination, in vitro fertilization of human egg cell. — Stock Photo
    Conceptual 3d illustration of artificial insemination, in vitro fertilization of human egg cell.
    Abstract animal cell on blue background, digital illustration. — Stock Photo
    Abstract animal cell on blue background, digital illustration.
    Blue colored nerve cell on dark background, digital illustration. — Stock Photo
    Blue colored nerve cell on dark background, digital illustration.
    Illustration of pink human egg cell on black background. — Stock Photo
    Illustration of pink human egg cell on black background.
    Abstract animal cells, digital illustration. — Stock Photo
    Abstract animal cells, digital illustration.
    Human brain cross-section — Stock Photo
    Human brain cross-section
    Visual rendering of Animal cells — Stock Photo
    Visual rendering of Animal cells
    Magnified digital illustration of leukocyte cell. — Stock Photo
    Magnified digital illustration of leukocyte cell.
    Atom with nucleus, atomic shell and orbiting electrons in monochromatic blue. — Stock Photo
    Atom with nucleus, atomic shell and orbiting electrons in monochromatic blue.
    Abstract artwork of human nerve cell structure. — Stock Photo
    Abstract artwork of human nerve cell structure.
    Abstract computer illustration of RNA polymerase transcribing DNA to messenger RNA mRNA. — Stock Photo
    Abstract computer illustration of RNA polymerase transcribing DNA to messenger RNA mRNA.
    Caudate nucleus of the brain, computer illustration — Stock Photo
    Caudate nucleus of the brain, computer illustration
    Medical illustration of human cell structure on dark background. — Stock Photo
    Medical illustration of human cell structure on dark background.
    Magnified digital illustration of mast cell. — Stock Photo
    Magnified digital illustration of mast cell.
    Illustration of human nervous receptors on black background. — Stock Photo
    Illustration of human nervous receptors on black background.
    Fat cells, computer illustration — Stock Photo
    Fat cells, computer illustration
    Neural network with connections, conceptual digital illustration. — Stock Photo
    Neural network with connections, conceptual digital illustration.
    Abstract animal cell on black background, digital illustration. — Stock Photo
    Abstract animal cell on black background, digital illustration.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Digital artwork showing inclusion composed of group of chlamydia reticulate bodies of Chlamydia trachomatis bacteria. — Stock Photo
    Digital artwork showing inclusion composed of group of chlamydia reticulate bodies of Chlamydia trachomatis bacteria.
    Primary ovarian follicle — Stock Photo
    Primary ovarian follicle
    Atomic structure, computer illustration — Stock Photo
    Atomic structure, computer illustration
    Magnified digital illustration of human cell cross-section. — Stock Photo
    Magnified digital illustration of human cell cross-section.
    Animal cell during cytokinesis (cell division), illustration. — Stock Photo
    Animal cell during cytokinesis (cell division), illustration.
    Conceptual 3d illustration of artificial insemination, in vitro fertilization of human egg cell. — Stock Photo
    Conceptual 3d illustration of artificial insemination, in vitro fertilization of human egg cell.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Scientific illustration of influenza virus particle. — Stock Photo
    Scientific illustration of influenza virus particle.
    Digital illustration of human cells on blue background. — Stock Photo
    Digital illustration of human cells on blue background.
    Digital illustration of blue human nerve cell. — Stock Photo
    Digital illustration of blue human nerve cell.
    Illustration of a neutrophil. — Stock Photo
    Illustration of a neutrophil.
    Cell division process — Stock Photo
    Cell division process
    Illustration of human nerve cell connections. — Stock Photo
    Illustration of human nerve cell connections.
    3d rendered illustration of purple nerve cell. — Stock Photo
    3d rendered illustration of purple nerve cell.
    Cross-section of human head anatomy — Stock Photo
    Cross-section of human head anatomy
    Fat cells, computer illustration — Stock Photo
    Fat cells, computer illustration
    Nerve cell with pink colored axon on blue background, digital illustration. — Stock Photo
    Nerve cell with pink colored axon on blue background, digital illustration.
    Caudate nucleus of the brain, computer illustration — Stock Photo
    Caudate nucleus of the brain, computer illustration
    Animal cells during cytokinesis (cell division), illustration — Stock Photo
    Animal cells during cytokinesis (cell division), illustration
    Orbital cut showing abducent nerve with ciliary ganglion and oculomotor nerve — Stock Photo
    Orbital cut showing abducent nerve with ciliary ganglion and oculomotor nerve