Adrenocorticotropin hormone (ACTH, corticotropin) can be described by weight or functional activity.
human ACTH: 39 amino acids
molecular weight 4,541 g
1 mg = 0.22 µmol
1 µmol = 4.54 mg
Pure ACTH has 150 to 200 units per mg
1 USP = 1 International Unit (IU) = 1 potency unit = 1 Armour unit
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