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           Volume 23, No 11, Nov 2013
 ISSN: 1001-0602 
EISSN: 1748-7838 2018 
impact factor 17.848* 
(Clarivate Analytics, 2019) 
Volume 23 Issue 11, November 2013: 1242-1243
Qiurong Ding1 and Chad A Cowan1
1Department of Stem Cell and Regenerative Biology, Harvard University, Sherman Fairchild Biochemistry Bldg 153, 7 Divinity Ave, Cambridge, MA 02138, USA Correspondence: Chad A Cowan, Tel: +1-617-496-5222; Fax: +1-617-496-8351(ccowan@fas.harvard.edu)