increased transitional stage B cell number abnormal transitional stage T3 B cell morphology increased transitional stage T3 B cell number 2010-07-13T11:32:54Z CL:0000960 MP:0010229 MPheno.ontology csmith greater number of a type of a transitional stage B cell that expresses surface IgM and IgD, and CD62L; it is an anergic B cell that does not proliferate upon BCR signaling, is found in the spleen and lymph nodes, and has the phenotype surface IgM-positive, surface IgD-positive, CD21-positive, CD23-positive, and CD62L-positive increased T3 stage B cell number increased transitional three stage B lymphocyte number increased transitional three stage B-cell number increased transitional three stage B-lymphocyte number