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Fig. 4. Amino acid sequences of pre-ecdysis-triggering hormone (PETH), ecdysis-triggering hormone (ETH) and ETH-associated peptide (ETH-AP) identified in Bombyx mori (Bom) Inka cells compared with related peptides from Manduca sexta (Mas) and Drosophila melanogaster (Drm). In both moths, PETH is identical and ETHs are very similar, while ETH-APs are conserved at the amino termini. Drosophila ETHs show homology with moth peptides at the carboxyl termini. Light shading shows amino acid similarity; dark shading shows amino acid homology.