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Abstract.This review will summarize the properties of five variant forms of human growth hormone: a disulfide dimer, a glycosylated form, 20 kD-hGH, and two peptides made up of portions of 22 kD-hGH.The two pituitary peptides (hGH1_43 and hGH44_191) have, respectively, insulin-potentiating and anti-insulin properties. Both have been detected in serum. The shorter peptide may prove to be useful in decreasing the amount of exogenous insulin required by diabetics. The larger, strongly anti-insulin peptide, may be involved in diabetic retinopathy.We believe that this peptide is the long sought after diabetogenic substance of the pituitary gland.

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