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Androgenic zone

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Androgenic zone --> X zone

a transient adrenocortical zone present in some rodents at birth, most notably in mice, situated between the zona reticularis and the adrenal medulla; it degenerates in males with the secretion at puberty and in females during their first pregnancy; it slowly enlarges in unmated females after puberty and does not degenerate until middle age; the X zone appears to secrete no hormone.

Synonym: androgenic zone.

Misnomer for the foetal adrenal cortex of primates.

Synonym: foetal reticularis.