Amino-Terminal Amino Acid Sequence of the Silkworm Prothoracicotropic Hormone: Homology with Insulin

Abstract
Three molecular forms of prothoracicotropic hormone were isolated from the head of the adult silkworm, Bombyx mori , and the amino acid sequence of 19 amino acid residues in the amino terminus of these prothoracicotropic hormones was determined. These residues exhibit significant homology with insulin and insulin-like growth factors.