Life Sciences, snail, Polychaete, Neurosciences, Developmental Biology, twist, Capitella sp. I, Spiralian mesoderm, Cell Biology, Embryo, Nonmammalian - cytology, Polychaeta - genetics, Nervous System - metabolism, RNA, Messenger - genetics, Embryo, Nonmammalian - metabolism, Mesoderm - cytology, Transcription Factors - genetics, RNA, Messenger - metabolism,...