S100a4-Cre-mediated deletion of Patched1 causes hypogonadotropic hypogonadism: role of pituitary hematopoietic cells in endocrine regulation by Ren, YA, Monkkonen, T, Lewis, MT, Bernard, DJ, Christian, HC, Jorgez, CJ, Moore, JA, Landua, JD, Chin, HM, Chen, W, Singh, S, Kim, IS, Zhang, XF, Xia, Y, Phillips, KJ, MacKay, H, Waterland, RA, Ljungberg, MC, Saha, PK, Hartig, SM, Coll, TF, Richards, JS