TY - RPRT TI - Activin signalling has a necessary function in Xenopus early development. AU - S Dyson AU - J B Gurdon PY - 1997 DO - 10.1016/s0960-9822(06)00030-3 UR - https://pubmed.ncbi.nlm.nih.gov/8999997/ ID - 8999997 ER -