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13C n.m.r. and thin-layer chromatography were used to monitor the degradation of methionine-enkephalinamide in the presence of neuroblastoma x glioma hybrid cells (NG 108-15) and membranes. Puromycin and trypsin treatment failed to protect enkephalinamide from degradation over long periods of time (up to 24 hours). The major degradation products of [3[2-13C]glycine] methionine-enkephalinamide observed by 13 C n.m.r. showed glycine-3 in a non-terminal position, an N-terminal position and free glycine. A minor component showed glycine-3 in a C-terminal position.
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