Activins. No muscles, but what a brain.
Lemaire
P
P
D028341:Activins; D000818:Animals; D047108:Embryonic Development; D006133:Growth Substances / Q000502:physiology*; D007265:Inhibins / Q000502:physiology*; D008648:Mesoderm / Q000502:physiology; D014982:Xenopus laevis / Q000196:embryology
D006133:Growth Substances; D028341:Activins; D007265:Inhibins