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    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is blue. Mitochondria (cyan)) in the cell's cytoplasm produce energy for the cell. Lysosomes (red) contain enzymes for digesting foreign particles. M — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is blue. Mitochondria (cyan)) in the cell's cytoplasm produce energy for the cell. Lysosomes (red) contain enzymes for digesting foreign particles. M
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    Human sperm cell, coloured scanning electron micrograph (SEM). — Stock Photo
    Human sperm cell, coloured scanning electron micrograph (SEM).
    Chlamydia bacteria, illustration — Stock Photo
    Chlamydia bacteria, illustration
    Primula pollen grain — Stock Photo
    Primula pollen grain
    Schizosaccharomyces pombe yeast — Stock Photo
    Schizosaccharomyces pombe yeast
    Abutilon sp. pollen grain — Stock Photo
    Abutilon sp. pollen grain
    Marine planktonic unicellular alga — Stock Photo
    Marine planktonic unicellular alga
    Anthrax bacteria structure — Stock Photo
    Anthrax bacteria structure
    Oligodendrocyte cell structure — Stock Photo
    Oligodendrocyte cell structure
    Fertilization showing sperm fertilizing an egg — Stock Photo
    Fertilization showing sperm fertilizing an egg
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    Illustration of single human blood cell on white background. — Stock Photo
    Illustration of single human blood cell on white background.
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand.
    Puffball fungus spore — Stock Photo
    Puffball fungus spore
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    Cancer cell characteristic — Stock Photo
    Cancer cell characteristic
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    Digital illustration of trophozoite form of Acanthamoeba castellanii amoeba. — Stock Photo
    Digital illustration of trophozoite form of Acanthamoeba castellanii amoeba.
    Campylodiscus fastuosus diatom — Stock Photo
    Campylodiscus fastuosus diatom
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Rod-shaped Anthrax bacteria — Stock Photo
    Rod-shaped Anthrax bacteria
    Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower. — Stock Photo
    Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower.
    Coloured scanning electron micrograph (SEM) of a tumour cell, showing pseudopodia protrusions (bottom left and right), a prominent feature of actively motile cells. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a tumour cell, showing pseudopodia protrusions (bottom left and right), a prominent feature of actively motile cells.
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Balamuthia mandrillaris amoeba, computer illustration — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration
    3d illustration of transparent and colorful protozoan on blue background. — Stock Photo
    3d illustration of transparent and colorful protozoan on blue background.
    Campylobacter bacteria colony — Stock Photo
    Campylobacter bacteria colony
    Hands of scientist using pipette and petri dish — Stock Photo
    Hands of scientist using pipette and petri dish
    Skimmia sp. pollen grain — Stock Photo
    Skimmia sp. pollen grain
    Sperm cell with multiple tails — Stock Photo
    Sperm cell with multiple tails
    Coloured scanning electron micrograph (SEM) of Schizosaccharomyces pombe yeast. — Stock Photo
    Coloured scanning electron micrograph (SEM) of Schizosaccharomyces pombe yeast.
    Skimmia sp. pollen grain — Stock Photo
    Skimmia sp. pollen grain
    Colored scanning electron micrograph of white blood cells and single platelet. — Stock Photo
    Colored scanning electron micrograph of white blood cells and single platelet.
    3d illustration of transparent and colourful protozoa. — Stock Photo
    3d illustration of transparent and colourful protozoa.
    Male sex cell — Stock Photo
    Male sex cell
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is brown. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (blue) contain enzymes for digesting foreign particles — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is brown. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (blue) contain enzymes for digesting foreign particles
    Cell culture plate on white background. — Stock Photo
    Cell culture plate on white background.
    Abutilon pollen grain — Stock Photo
    Abutilon pollen grain
    Male sex cell — Stock Photo
    Male sex cell
    Single abstract bacterium on black background, computer illustration. — Stock Photo
    Single abstract bacterium on black background, computer illustration.