Strongly inhibits juvenile hormone biosynthesis. In its non-pyroglutamate form, expressed in antennal lobe (AL), corpora cardiaca (CC), corpora allata (CA) and gnathal ganglion (GNG) with expression in AL detected in most animals and expression in CC, CA and GNG detected in few animals (at protein level). In its pyroglutamate form, expressed in antennal lobe (AL), corpora cardiaca (CC) and corpora allata (CA) with expression detected in few animals (at protein level). Not expressed in GNG (protein level). Non-pyroglutamate form. Pyroglutamate form. Belongs to the allatostatin family.