I believe in one of the threads the subject of human chimeras came up, but I can't remember which thread it was.

Apparently human chimeras actually do exist!

http://boingboing.net/2009/05/01/the-mind-blowing-wor.html

Wow...the idea of a woman giving birth to her twin sister's babies...
This leaves me wondering, is it possible with polyembriotic citrus for the zygotic hybrid to end up fused with cells from the mother plant? Is there any chance that this is why some crosses with Poncirus in their ancestry end up with some leaves that are trifoliate, bifoliate to either side of the main leaflet as well as fused to it, or monofoliate? Just curious if chimera seedlings are known to exist or not.