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    B-lymphocyte white blood cells — Stock Photo
    B-lymphocyte white blood cells
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs — Stock Photo
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs
    Coloured scanning electron micrograph of cancer cells from colon. — Stock Photo
    Coloured scanning electron micrograph of cancer cells from colon.
    Colored scanning electron micrograph of human red blood cells erythrocytes, white blood cells leukocytes and platelet thrombocyte. — Stock Photo
    Colored scanning electron micrograph of human red blood cells erythrocytes, white blood cells leukocytes and platelet thrombocyte.
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Caenorhabditis elegans parasite worm, colored scanning electron micrograph. — Stock Photo
    Caenorhabditis elegans parasite worm, colored scanning electron micrograph.
    Carcinoma cell, coloured transmission electron micrograph (TEM). — Stock Photo
    Carcinoma cell, coloured transmission electron micrograph (TEM).
    Fat cell. Coloured scanning electron micrograph (SEM) of part of a fat-storing cell (adipocytes). Fat cells are one of the largest cell types in the human body, each cell being 100 to 120 microns in diameter — Stock Photo
    Fat cell. Coloured scanning electron micrograph (SEM) of part of a fat-storing cell (adipocytes). Fat cells are one of the largest cell types in the human body, each cell being 100 to 120 microns in diameter
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Fly head anatomy — Stock Photo
    Fly head anatomy
    Hair shafts growing from human skin — Stock Photo
    Hair shafts growing from human skin
    Coloured scanning electron micrograph of bacteria cultured from mobile phone. — Stock Photo
    Coloured scanning electron micrograph of bacteria cultured from mobile phone.
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    Coloured scanning electron micrograph (SEM) of a freeze fracture of the vagina showing the stratified squamous epithelium and the underlying lamina propria — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze fracture of the vagina showing the stratified squamous epithelium and the underlying lamina propria
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Zika virus particles — Stock Photo
    Zika virus particles
    Dividing prostate gland cancer cells, colored scanning electron micrograph. — Stock Photo
    Dividing prostate gland cancer cells, colored scanning electron micrograph.
    Scanning electron micrograph of bacterial culture from sputum. — Stock Photo
    Scanning electron micrograph of bacterial culture from sputum.
    Fungal cells with sporangia and spores — Stock Photo
    Fungal cells with sporangia and spores
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death. — Stock Photo
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death.
    Bottlebrush pollen grain — Stock Photo
    Bottlebrush pollen grain
    Lung tissue, coloured transmission electron micrograph (TEM). A pulmonary capillary containing two red blood cells (red) and three platelets (blue). A basement membrane (pink) surround the endothelium separating it from the alveolar epithelium — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM). A pulmonary capillary containing two red blood cells (red) and three platelets (blue). A basement membrane (pink) surround the endothelium separating it from the alveolar epithelium
    Skin cancer cell — Stock Photo
    Skin cancer cell
    Fly larva head anatomy — Stock Photo
    Fly larva head anatomy
    Aulacodiscus oregonus diatom — Stock Photo
    Aulacodiscus oregonus diatom
    Clematis montana pollen — Stock Photo
    Clematis montana pollen
    Male sex cell — Stock Photo
    Male sex cell
    Sarcoptic mange mites eggs — Stock Photo
    Sarcoptic mange mites eggs
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs — Stock Photo
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs
    Ovarian cancer cells, coloured scanning electron micrograph. — Stock Photo
    Ovarian cancer cells, coloured scanning electron micrograph.
    Actinocyclus sp. diatom unicellular algae — Stock Photo
    Actinocyclus sp. diatom unicellular algae
    Pollen threads and brochosomes — Stock Photo
    Pollen threads and brochosomes
    Dividing prostate cancer cells, coloured scanning electron micrograph. — Stock Photo
    Dividing prostate cancer cells, coloured scanning electron micrograph.
    Bird bone tissue — Stock Photo
    Bird bone tissue
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze. — Stock Photo
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze.
    Carcinoma cell, coloured transmission electron micrograph (TEM). — Stock Photo
    Carcinoma cell, coloured transmission electron micrograph (TEM).
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph. — Stock Photo
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph.
    Human red blood cells — Stock Photo
    Human red blood cells
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Feet bacteria. Coloured scanning electron micrograph (SEM) of bacteria cultured from between toes of foot — Stock Photo
    Feet bacteria. Coloured scanning electron micrograph (SEM) of bacteria cultured from between toes of foot
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph. — Stock Photo
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph.
    Tendon, coloured scanning electron micrograph (SEM), showing bundles of collagen fibres. The parallel alignment of the fibres make tendons inelastic but flexible. Tendons attach muscle to bone. Magnification: x5000 when printed at 10 centimetres wide — Stock Photo
    Tendon, coloured scanning electron micrograph (SEM), showing bundles of collagen fibres. The parallel alignment of the fibres make tendons inelastic but flexible. Tendons attach muscle to bone. Magnification: x5000 when printed at 10 centimetres wide
    Tendon, coloured scanning electron micrograph showing bundles of collagen fibres. — Stock Photo
    Tendon, coloured scanning electron micrograph showing bundles of collagen fibres.
    Centric fossil diatom frustule — Stock Photo
    Centric fossil diatom frustule
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells. — Stock Photo
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells.
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis — Stock Photo
    Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis
    Coloured scanning electron micrograph of pollen grains from Verbena bonariensis perennial plant. — Stock Photo
    Coloured scanning electron micrograph of pollen grains from Verbena bonariensis perennial plant.
    Liradiscus sp. planktonic unicellular algae — Stock Photo
    Liradiscus sp. planktonic unicellular algae
    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
    Albumen crystals, coloured scanning electron micrograph (SEM). — Stock Photo
    Albumen crystals, coloured scanning electron micrograph (SEM).
    Lining of the small intestine — Stock Photo
    Lining of the small intestine
    Dog tapeworm head — Stock Photo
    Dog tapeworm head
    Vaginal bacteria. Coloured scanning electron micrograph (SEM) of bacteria on the vaginal wall. A healthy vaginal flora protects the body against urogenital infections — Stock Photo
    Vaginal bacteria. Coloured scanning electron micrograph (SEM) of bacteria on the vaginal wall. A healthy vaginal flora protects the body against urogenital infections
    Vaccinia virus particle — Stock Photo
    Vaccinia virus particle
    Marine planktonic unicellular alga — Stock Photo
    Marine planktonic unicellular alga