title: Human stem cells and drug screening: opportunities and challenges.
authors.affiliation: Stem Cell and Regenerative Medicine Center, University of Wisconsin-Madison, 1111 Highland Avenue, Wisconsin 53705, USA.
authors.forename: Allison D
authors.initials: AD
authors.lastname: Ebert
authors.forename: Clive N
authors.initials: CN
authors.lastname: Svendsen