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Segment polarity gene

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Definition

noun

A segmentation gene whose function is to define the anterior and posterior polarities within each embryonic parasegment.


Supplement

The segmentation polarity genes as the name implies are genes responsible for the polarity within each parasegment of the embryo. Examples are engrailed and gooseberry genes. These genes are expressed sequentially after pair-rule gene.


See also: segmentation gene, zygotic gene.