| PG | prothoracic gland |
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| prothoracic | <zoology> Of or pertaining to the prothorax. Source: Websters Dictionary (01 Mar 1998) |
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| prothoracic glands | <entomology> Insect structures that originate from the ectoderm of the ventrocaudal part of the head and serve as a source of ecdysone. Synonym: peritracheal glands, prothoracic glands, thoracic glands, ventral glands. (05 Mar 2000) |
| prothoracicotropic h. |
in the development of insects, the hormone that controls secretion of ecdysone by the prothoracic glands. It is secreted by a gland in the brain.
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