Abstract
Human met-enkephalin from an adrenal medullary tumour has been purified and characterised. Two groups of putative human met-enkephalin precursors (MW ∼ 2000) were also isolated and were only opiate active after trypsinisation and yielded met-enkephalin on further treatment with carboxypeptidase B. Amino acid analyses of these peptides show they are not related to β-LPH nor any other reported putative enkephalin precursors. Their amino acid compositions suggest they are structurally closely related and may represent two groups of heterologous peptides.
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