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It is well known that phosphorylation of extracellular signal‐regulated kinase (ERK) is involved in prothoracicotropic hormone (PTTH)‐stimulated ecdysteroidogenesis in insect prothoracic glands (PGs). In the present study, we further investigated the downstream signalling pathways. Our results showed that PTTH stimulated p90 ribosomal S6 kinase (RSK) phosphorylation at Thr573 in Bombyx mori PGs both...