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  • Title: Studies on prolactin 48: isolation and properties of the hormone from horse pituitary glands.
    Author: Li CH, Chung D.
    Journal: Arch Biochem Biophys; 1983 Jan; 220(1):208-13. PubMed ID: 6830233.
    Abstract:
    Isolation of prolactin from equine pituitary glands has been described. It has a potency of 42 IU/mg in the pigeon crop-sac test and consists of 199 amino acids. The hormone has only four half-cystine residues in contrast to other mammalian prolactins which have six residues. From NH2-terminal sequence analysis and amino acid composition of cyanogen bromide fragments, the NH2-terminal disulfide loop is missing in the equine prolactin molecule. Circular dichroism spectra indicate that the alpha-helical content of equine prolactin appears to be lower (50%) than that found in the ovine hormone (65%).
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