Stem Cells Portal, 27 Apr 2012 http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0035553
Open Access, 20 Apr 2012 by Skye C. McIver, Simone J. Stanger, Danielle M. Santarelli, Shaun D. Roman, Brett Nixon, Eileen A.