HLA-C and infarction: We found that in vitro differentiation of allogeneic MSCs was accompanied by changes in the expression of the MHC cell surface antigens related to immune rejection [2], and in a more recent study, we found that preserving the PGE2 level prevented rejection of implanted allogeneic MSCs and restored post-infarction ventricular function (Sanjiv Dhingra, Peng Li, Xi-Ping Huang, Jian Guo, Jun Wu, Anton Mihic, Shu-Hong Li, Wang-Fu Zang, Daniel Shen, Richard D. Weisel, Pawan K. Singal, Ren-Ke Li, submitted).