Germ cell and somatic stem cell biology in reproduction

Reprinted from Zhou, Q. and Griswold, M.D., Regulation of spermatogonia (July 14, 2008), StemBook, ed. The Stem Cell Research Community, StemBook, doi/10.3824/stembook.1.7.1, http://www.stembook.org. This work is licensed under a Creative Commons Attribution 3.0 Unported License.