Comment on

• Expression cloning of noggin, a new dorsalizing factor localized to the Spemann organizer in Xenopus embryos.

  Smith WC, Harland RM. Smith WC, et al. Cell. 1992 Sep 4;70(5):829-40. doi: 10.1016/0092-8674(92)90316-5. Cell. 1992. PMID: 1339313
• Localized enhancement and repression of the activity of the TGF-beta family member, decapentaplegic, is necessary for dorsal-ventral pattern formation in the Drosophila embryo.

  Ferguson EL, Anderson KV. Ferguson EL, et al. Development. 1992 Mar;114(3):583-97. doi: 10.1242/dev.114.3.583. Development. 1992. PMID: 1618130
• Regulation of neural induction by the Chd and Bmp-4 antagonistic patterning signals in Xenopus.

  Sasai Y, Lu B, Steinbeisser H, De Robertis EM. Sasai Y, et al. Nature. 1995 Jul 27;376(6538):333-6. doi: 10.1038/376333a0. Nature. 1995. PMID: 7630399