Abstract
We measured with radioimmunoassay the β-endorphin-like and α-MSH-like immunoreactivities in milk and plasma of 8 lactating women. Mean β-endorphin concentrations (± SD) were 16.6 ± 6.7 fmol/ml in milk and 9.9 ± 4.1 fmol/ml in plasma. α-MSH concentrations (mean ± SD) were 39.4 ± 15.5 pg/ml in milk and 18.2 ± 8.4 pg/ml in plasma. The concentrations of both peptides in milk were significantly (p< 0.05) higher than in plasma. No significant correlation between milk and plasma concentrations of these peptides was found.
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