Abstract
1. Sialidase digestion resulted in a decreased electrophoretic mobility of pig transferrins without destroying their ability to bind iron.2. The decrease in electrophoretic mobility occurred in two distinct steps.3. The migration rates of the final sialidase digestion products of TfA and TfB suggest that the difference in mobilities of TfA and TfB is not due to a difference in the amount of sialic acid which each contains.4. The mobility differences between the three zones observed for both TfA and TfB under high voltage Tris–citrate gel analyses do not appear to be due to the amount of sialic acid possessed by each.
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