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Simplified diagram of the internal structures of a polychaete worm, showing the segments.

(genetic biology)

Grammar: noun
plural: segments
Definition: a clearly differentiated subdivision of an organism or part of an organism
Example:
1. Structures within segments are generated by primary organiser cells that secrete growth factors.

2. Different regions of an embryo express different sets of homeobox genes that specify which segment a cell belongs to.
Related Word: segment (verb), segmental (adjective)