The sea squirt can regenerate its whole body from the vasculature. I asked Ayelet Voskoboynik, postdoctoral fellow from the Weissman lab, Stanford University, to tell us how. Their findings were published in a recent paper, entitled Striving for normality: whole body regeneration through a series of abnormal generations
(FASEB Journal, 2007 May;21(7):1335-44.)
Image source: the FASEB Journal, thanks to Cody Mooneyhan.