Scanning Electron Micrograph (SEM) showing lymphocytes (white blood cells). A lymphocyte is one of the subtypes of white blood cell in a vertebrate's immune system. Lymphocytes include natural killer cells (NK cells) (which function in cell-mediated, cytotoxic innate immunity), T cells (for cell-mediated, cytotoxic adaptive immunity), and B cells (for humoral, antibody-driven adaptive immunity). They are the main type of cell found in lymph, which prompted the name lymphocyte. Magnification unknown.

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Keywords: biology, blood, bw, cell, cells, electron, em, hematology, imaging, immune, include, killer, lymphocyte, lymphocytes, medical, micrograph, natural, nk, scanning, science, sem, showing, subtypes, system, vertebrate, wbc, white