https://doi.org/10.1351/goldbook.11017
Growth factor of the transforming growth factor \(\upbeta\!\) (TGF-\(\upbeta\!\)) superfamily, coded by a gene designated NODAL, that plays crucial roles in embryogenesis, particularly in signalling from the primitive streak to the mesoderm to establish left-right asymmetry as well as aspects of stem cell differentiation.
Note: The name derives from expression of the gene in the primitive node.