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    Illustration of malaria infected blood cells. — Stock Photo
    Illustration of malaria infected blood cells.
    Zika virus particles — Stock Photo
    Zika virus particles
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Immune response to cancer — Stock Photo
    Immune response to cancer
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Giant cell tumour of the bone — Stock Photo
    Giant cell tumour of the bone
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Neural network showing synaptic terminals — Stock Photo
    Neural network showing synaptic terminals
    Fat in blood cells blocking blood vessel, digital illustration. — Stock Photo
    Fat in blood cells blocking blood vessel, digital illustration.
    3d illustration of activated platelets and thrombocytes while healing and closure of wound. — Stock Photo
    3d illustration of activated platelets and thrombocytes while healing and closure of wound.
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with from primary biliary cirrhosis. Cirrhosis is a disease in which bands of fibrosis (internal scarring) break up the internal structure of the liver — Stock Photo
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with from primary biliary cirrhosis. Cirrhosis is a disease in which bands of fibrosis (internal scarring) break up the internal structure of the liver
    Destruction of a human embryo — Stock Photo
    Destruction of a human embryo
    Lymphocyte white blood cells in human lymphatic system, digital illustration. — Stock Photo
    Lymphocyte white blood cells in human lymphatic system, digital illustration.
    16-cell morula embryo — Stock Photo
    16-cell morula embryo
    Cryptococcus neoformans fungus, illustration. C. neoformans is a yeast-like fungus that reproduces by budding. An acidic mucopolysaccharide capsule completely encloses the fungus — Stock Photo
    Cryptococcus neoformans fungus, illustration. C. neoformans is a yeast-like fungus that reproduces by budding. An acidic mucopolysaccharide capsule completely encloses the fungus
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Fertilisation of egg cell with spermatozoa, digital illustration. — Stock Photo
    Fertilisation of egg cell with spermatozoa, digital illustration.
    Normal human red blood cell — Stock Photo
    Normal human red blood cell
    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    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
    Illustration of abnormal red blood cells known as spur cells acanthocytes. — Stock Photo
    Illustration of abnormal red blood cells known as spur cells acanthocytes.
    Colored illustration of cancer cell being attacked by white blood cells. — Stock Photo
    Colored illustration of cancer cell being attacked by white blood cells.
    3d illustration of red transparent sperm cells swimming towards egg cell. — Stock Photo
    3d illustration of red transparent sperm cells swimming towards egg cell.
    Conceptual digital illustration of human blastocyst on needle tip. — Stock Photo
    Conceptual digital illustration of human blastocyst on needle tip.
    HIV virus particles — Stock Photo
    HIV virus particles
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Visual rendering of Cells — Stock Photo
    Visual rendering of Cells
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery
    Illustration of abnormal red blood cells known as spur cells acanthocytes. — Stock Photo
    Illustration of abnormal red blood cells known as spur cells acanthocytes.
    Digital illustration showing vaginitis caused by Candida albicans fungus and close-up of yeast cells. — Stock Photo
    Digital illustration showing vaginitis caused by Candida albicans fungus and close-up of yeast cells.
    3d illustration showing increase of non-functional white blood cells in leukaemia. — Stock Photo
    3d illustration showing increase of non-functional white blood cells in leukaemia.
    Coloured scanning electron micrograph of cancer cells migrating down pores. — Stock Photo
    Coloured scanning electron micrograph of cancer cells migrating down pores.
    Female reproductive system — Stock Photo
    Female reproductive system
    Intestinal brush border in small intestine showing numerous microvilli, colored transmission electron micrograph. — Stock Photo
    Intestinal brush border in small intestine showing numerous microvilli, colored transmission electron micrograph.
    Artery partially blocked by atheroma — Stock Photo
    Artery partially blocked by atheroma
    Structure of islet of langerhans, light micrograph. — Stock Photo
    Structure of islet of langerhans, light micrograph.
    Illustration of cell membrane with embedded proteins, molecules and T-cell receptor. — Stock Photo
    Illustration of cell membrane with embedded proteins, molecules and T-cell receptor.