B lymphocytes in the colon, light micrograph
Fluorescence deconvolution micrograph of b lymphocyte white blood cells (pink) in colon tissue. B lymphocytes recognise specific sites (antigen) on the surface of a pathogen or foreign object and produce antibodies against it., Photo by R. BICK, B. POINDEXTER, UT MEDICAL SCHOOL/SCIENCE PHOTO LIBRARY
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