title: Reply.
authors.affiliation: Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA.
authors.forename: Amanda S
authors.initials: AS
authors.lastname: Janesick
authors.affiliation: Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA. Electronic address: blumberg@uci.edu.
authors.forename: Bruce
authors.initials: B
authors.lastname: Blumberg