Noun
One of the actual or ideal serial segments of which an animal, esp. an articulate or vertebrate, is is composed; somatome; metamere.
Source: Webster's dictionaryBoundaries for each somite are regulated by retinoic acid (RA) and a combination of FGF8 and WNT3a. Source: Internet
The neural tube activates the protein WNT1 that expresses PAX 2 so the somite creates the myotome and dermatome. Source: Internet
The notochord and the neural tube activate the protein SHH which helps the somite to form its sclerotome. Source: Internet