CHIMERAS, dizygotic twins who have two populations of blood cells, arise when hæmatopoietic cells are exchanged or shared at some time in early embryonic life. The first case of chimerism in man was ...

I've long been a big fan of Greek mythology and all the wondrous beasts that tested, and sometimes bested, mythical heroes. One such creature was the chimera, a grotesque hybrid of a lion, goat, and ...