little adrenocorticotropic hormone (ACTH)

lit·tle a·dre·no·cor·ti·co·trop·ic hor·mone (ACTH)

(lit'ĕl ă-drē'nō-kōr'ti-kō-trō'pik hōr'mōn)
The conventional ACTH molecule when contrasted with big ACTH.