Affiliation: | Departments of *Cell and Molecular Biology and ;†Molecular Medicine, Karolinska Institutet, 171 77 Stockholm, Sweden; ;‡School of Molecular and Biomedical Science and Australian Research Council, Special Research Centre for Molecular Genetics of Development, University of Adelaide, Adelaide SA 5005, Australia; and ;§Protein Discovery Centre, Queensland Institute of Medical Research, Brisbane, Queensland 4029, Australia |