Signaling protein released by the notochord, important in somite patterning and nervous system development.
See also: Spemann organizer
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 785 (https://doi.org/10.1515/pac-2015-1202)