PTTHProthoracicotropic Hormone
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This is attributed to a disruption of endocrine events as the down-regulation of haemolymph ecdysteroid level through the blockage of release of PTTH, prothoracicotropic hormone, from the brain-corpus cardiacum complex, or to a delay in the appearance of the last ecdysteroid peak showing a complete moult inhibition.
The tensile strength of the neat PTTH increased with increasing clay content.