Biology Department, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
†These authors contributed equally to the manuscript. Present addresses: §Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0355
Carl Wieman Science Education Initiative, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
#Botany Department, University of British Columbia, Vancouver, BC V6T 1Z4, Canada ¶Department of Biology, Saint Mary’s University, Halifax, NS B3H 3C3, Canada