<prompt> CD 3 receptor is seen in -T cellsB cellsMacrophagesEosinophils  <response>: Ans. is a i.e., T cells CD markero Lymphocytes and other leukocytes have a number of surface antigens or marker - leukocyte differentiation antigen.o A particular leucocyte differentiation antigen has been given a CD cluster of differentiation number on the bases of its reaction with a cluster of monoclonal antibodies,o These markers reflect the stage of differentiation and functional properties of cell.Leucocyte differentiation antigens a few examplesCD numberCell type associationCD 1CD 2CD 3CD 4CD 8CD 19Thymocytes, Langerhans cellsT cell SRBC receptorT cell antigen receptor complexHelper T cell receptor for HIVSuppressorcytotoxic T cellsB cells 