Blockage of adult development by brain removal and its resumption by application of the prothoracicotropic hormone (PTTH) were studied using pupae of a racial hybrid J-122 × C-115 of Bombyx mori. A log-linear dose-response relationship was obrained after injection of a PTTH solution. The Bombyx-unit of PTTH has been defined from this dose-response curve.
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Ishizaki et al. (1983) studied this question.
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