Definition: One of the paired, metamerically arranged cell masses formed in the early embryonic paraxial mesoderm; commencing in the third or early fourth week in the region of the hindbrain, they develop in a caudal direction typically until 42 pairs are formed.
Synonym(s): mesoblastic segment
[G. soma, body, + -ite]
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Examples: glitazone, GI cocktail, etc.