Phenotype of UCB MSCs. Cells were cultured for 5 to 7 passages, harvested, and labeled with antibodies against human antigens (A) CD3, CD7, CD19, CD29, CD31, CD33, CD34, CD44, CD45, CD49b, CD49d, CD51, CD58, CD62L, CD62P, CD90, CD105, CD117, CD133, CD135, HLA-ABC, and HLA-DR, and with (B) SH-2, SH-3, SH-4, as indicated and analyzed by FACS. (A) Shaded histogram indicates background signal; open histogram, positive reactivity with the indicated antibody. (B) Open histogram indicates background signal; shaded histogram, positive reactivity.