title: Tissue strategies as developmental constraints: Implications for animal evolution.
abstract: A consideration of developmental constraints at the tissue level brings into focus the relationship between genes, cell behavior and morphological evolution. This common framework provides a rationale for phenomena as seemingly divergent as the lack of homeotic appendages in humans and the Cambrian explosion.
authors.affiliation: Ellen Larsen is at the Dept of Zoology, University of Toronto, Toronto, Canada M5S IA1.
authors.forename: E W
authors.initials: EW
authors.lastname: Larsen