The team wants to develop chimeras—organisms composed of cells from two or more species—capable of growing human organs. Similar experiments using pig or sheep embryos have faced technical challenges, ...

Instead of blending perfectly together, the cells maintain their genetic characteristics, leading to two radically different looking tissues being presented on one animal. [1] Chimeras are ...

I noted an anogenital spot in 8 of 19 inspected female chimeras that were produced from ES cells from either genetic background (Fig. 1). Presence of the anogenital spot did not necessarily ...