DR. STANLEY FLEGLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY DR. STANLEY FLEGLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Lymphocyte, a type of white blood cell or leucocyte. This small lymphocyte is slightly smaller than a red blood cell. Small lymphocytes can be further classified as T or thymus derived cells or B or bone marrow derived cells. Lymphocytes vary considerably in their appearance and T cells and B cells cannot be distinguished by morphology but only by their origin. SEM X10,000 (based on 4 x 5 ).
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