Human Growthhormone (GH) is a single-chain, non-glycated, 191-amino acid hydrophilic globulin with a molecular weight of 21700Da and an isoelectric point Pi of 4.9. Disulfide bonds were formed between 53 and 165Chemicalbook sites and 182 and 189 cysteine residues. Approximately 75% of the growth hormone secreted by the anterior pituitary eosinophils is secreted in this molecular structure, and 5% to 10% is secreted in the form of 20kDa molecular weight