Bovine ligamentum nuchae elastin that had been partially digested by porcine pancreatic elastase and then thoroughly washed with 0.2 M-NaC1/0.05 M-sodium borate solution continued to release peptide fragments in solution. Complete removal of elastase from the elastin surface required extraction with dilute alkali, a procedure that does not irreversibly inactivate the enzyme or hydrolyse elastin.

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