Please supply the link which states they withdrew their signatures. Here are the names of the individuals that agreed with the concerns raised in the original document. Please feel free to contact anyone of them.
Dan Krane, chief executive officer and chairman of the board of directors, Forensic Bioinformatics
Jason Gilder, systems engineer, Forensic Bioinformatics
Joy Halverson, DVM, director, Zoogen Services
Laurence D. Mueller, professor of ecology and evolutionary biology, University of California, Irvine
Marc Taylor, president, Technical Associates
Rick Staub, Ph.D., director of laboratory operations, Orchid Cellmark, Dallas, Texas
Simon Ford, Ph.D., Lexigen Science and Law Consultants