Phylogenetic relationship of unconventional myosin family members between zebrafish (Danio rerio), mouse (Mus musculus), and man (Homo sapiens). Rectangular tree rooted to Myo1, with bootstrap values for family members that were examined in this report (see Methods for details). Myosins for whom ESTs were characterized are identified by underlines. Those myosins among these that were expressed in zebrafish embryos (15–36 hpf) are identified by bold type (Table 1). Zebrafish myosins outside these two categories but included in this phylogenetic tree were identified solely from database searches. Abbreviations: CaA, cardiac myosin A; Peri, Perinatal skeletal myosin (Myhc8); Smyhc, Slow myosin heavy chain.