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Acid/urea gel of nuclear proteins from enriched populations of steps 12 and 13 spermatids (A) and steps 12–16 spermatids (B) from wild-type, heterozygous, and Tnp1−/− mice (B6 × 129 F2). pP2 is the primary translation product of the Prm2 gene; pP2/11 and pP2/20 result from proteolytic cleavage before the 11th and 20th amino acids, respectively.
