Evaluation of MHC-II expression in MSCs from BM, AT and UC using the immunocytochemistry technique. Immunocytochemistry of MSCs from equine BM (A), AT (B) and UC (C) during the third passage to evaluate the expression of the MHC-II cell surface marker. MSCs from the sources analyzed did not express MHC-II. 200x (A, B) and 100x (C) magnification. AT, adipose tissue; BM, bone marrow; MSCs, mesenchymal stem cells; UC, umbilical cord.