Adjective
prothoracicotropic (comparative more prothoracicotropic, superlative most prothoracicotropic)
(biology) That modifies the behaviour of the prothoracic gland
Neurosecretory cells in an insect's brain secrete a hormone, the prothoracicotropic hormone (PTTH) that activates prothoracic glands, which secrete a second hormone, usually ecdysone (an ecdysteroid ), that induces ecdysis. Source: Internet
Pupa Chrysalis of gulf fritillary When the larva is fully grown, hormones such as prothoracicotropic hormone (PTTH) are produced. Source: Internet