How embryos tell heads from tails.
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D028341:Activins; D000818:Animals; D004331:Drosophila melanogaster / Q000196:embryology; D004627:Embryonic Induction; D005801:Genes, Homeobox; D007265:Inhibins / Q000502:physiology; D009024:Morphogenesis; D011518:Proto-Oncogene Proteins / Q000502:physiology; D051153:Wnt Proteins; D014982:Xenopus laevis / Q000196:embryology*; D029961:Zebrafish Proteins
D011518:Proto-Oncogene Proteins; D051153:Wnt Proteins; D029961:Zebrafish Proteins; D028341:Activins; D007265:Inhibins