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Electrophoretic mobility of the fetal red blood cell.

The electrophoretic mobilities of fetal and adult red blood cells have been examined. The mean mobility values for intact fetal and adult erythrocytes were the same, and there was no difference in mobility between the fetal and adult red blood cells treated with neuraminidase. However, a significant difference was observed after trypsin digestion. This may be due to a difference in composition between the fetal and adult red cell membranes.