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    Close-up of microbes and fungus growing on agar plate on white background. — Stock Photo
    Close-up of microbes and fungus growing on agar plate on white background.
    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.
    Light micrograph of a section through the surface of a tonsil showing the stratified squamous epithelium (pink) and underlying lymphoid tissue. — Stock Photo
    Light micrograph of a section through the surface of a tonsil showing the stratified squamous epithelium (pink) and underlying lymphoid tissue.
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Illustration of a dendritic cell (centre, purple) activating T-cells (teal). Dendritic cells recognise viruses and present information about their antigens to T-cells — Stock Photo
    Illustration of a dendritic cell (centre, purple) activating T-cells (teal). Dendritic cells recognise viruses and present information about their antigens to T-cells
    Digital artwork of T-lymphocyte cells attacking red cancer cell. — Stock Photo
    Digital artwork of T-lymphocyte cells attacking red cancer cell.
    B-lymphocyte cells, computer illustration — Stock Photo
    B-lymphocyte cells, computer illustration
    Colored thyroid cancer cells, digital illustration. — Stock Photo
    Colored thyroid cancer cells, digital illustration.