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The acetic acid-urea polyacrylamide gel electrophoresis system could separate very similar basic proteins on differences in size and effective charge. This system has been used for many years to analyse histones and their post-translational modifications and widely used in the study of mammal protamines. Two types of protamine have been described, the protamine 1 (P1) and the protamine 2 (P2) family members, which are synthetized by PRM1 and PRM2 genes. The ratio of P1 and P2 is important for predicting fertility in humans and mice. Th