Wednesday, October 14, 2009

Plasmocytes, or plasma cells, are spherical cells which take part in the synthesis and release of antibodies. Plasmocytes and effector B cells produce large volumes of antibodies which are carried by the blood plasma and the lymphatic system. Although plasma cells originate in the bone marrow, they are produced in the bone marrow as B cells, before they finally differentiate into plasmocytes. This happens when B cells are activated by antigens. secrete high levels of antibodies,ranging from hundreds to thousands of antibodies per second per cell. Unlike their precursors, plasma cells can not switch antibody classes and act as antigen-presenting cells because they no longer display MHC-II.