About the Authors
Department of Developmental Biology and Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California, United States of America
Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
University of British Columbia, Vancouver, British Columbia, Canada
The authors have declared that no conflicts of interest exist.
PFC, CLP, DS, and DMK conceived and designed the experiments. PFC, CLP, KN, BJB, MDS, and DS performed the experiments. PFC, CLP, and DMK analyzed the data. DS contributed reagents/materials/analysis tools. PFC, CLP, MDS, and DMK wrote the paper.