About the cover
A cardiovascular progenitor population from human fetal hearts capable of generating all the main cardiac cell types is described this week by Kenneth Chien and colleagues. Despite glimpses of success, the road to cardiac regenerative medicine is proving a long haul [see News, p. 18]. The cover image, by Paul R. Riley, illustrating a heart wrapped in a layer of regenerating cells, is from a study showing that thymosin β4 guides progenitor cells from the outer layer of the heart to tissue repair sites.
