1 mayo 2015
Continually producing sperm over a long time is important to procreate the next generation. Researchers have revealed that there are differences in reactivity to retinoic acid in spermatogonial stem cells, and these differences are a key factor to the persistence of sperm production with inexhaustible stem cells.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/IGdmxsY5CQI/150501095957.htm
