Affiliation: | (1) Department of Biology, Boston College, 02167 Chestnut Hill, MA, USA;(2) Zoology Department, University of Massachusetts, 01003 Amherst, MA, USA;(3) Zymogenetics Inc., 2121 North 35th Street, 98103 Seattle, WA, USA;(4) Present address: Anatomy Department, University of Massachusetts Medical School, Worcester, MA, USA |