Generation of Met-enkephalin Arg6Phe7 immunoreactivity by proteolytic cleavage of mammalian plasma precursors by pepsin.


A region-specific antiserum raised against the C-terminal heptapeptide of proenkephalin A (Met-enk Arg6Phe7) was used in RIA studies to show that rat, human, and ovine plasma contain substrates (mol wt, 68K) that yield nanomolar amounts of Met-enk Arg6Phe7 (ME-RF) after treatment with pepsin under acid conditions. This ovine plasma-derived immunoreactivity… (More)


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