ACTH (11-24) is a fragment of adrenocorticotrophin, induces cortisol release. ACTH (11-24) has been identified as a competitive antagonist of ACTH (1-39) and ACTH (1-10) in isolated adrenal cells.
ACTH (4-11) is a peptide fragment of adrenocorticotropic hormone, a peptide hormone found in the brain that is involved in the biological stress response.