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SDS-PAGE analyses of the pregnancy plug mucins. Freeze-dried pregnancy plug mucins (20 μg) before (a) and after (b) caesium chloride density gradient purification were separated on 10% SDS-PAGE and stained with Coomassie Brilliant Blue (lanes 1, 2 and 4) and PAS (lanes 3 and 5). Lane 1 is molecular weight marker in kDa.
