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Sodium dodecyl sulfate–polyacrylamide gel electrophoresis analysis of human milk mucins from a pool of 20 human milk donors. The 4–12% gradient sodium dodecyl sulfate–polyacrylamide gel–electrophoresed gel was stained with periodic acid–Schiff reagent. Mucin 1 and mucin 4 were identified by western blot. The arrows indicate mucin 1, mucin 4, and an unknown band.
