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Hough SR, Thornton M, Mason E, Mar JC, Wells CA, Pera MF.Hough SR, et al.Stem Cell Reports. 2014 May 22;2(6):881-95. doi: 10.1016/j.stemcr.2014.04.014. eCollection 2014 Jun 3.Stem Cell Reports. 2014.PMID: 24936473Free PMC article.