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Fig. 1. Light microscopy of testis sections from 31-day-old wild-type (A), heterozygous (B) and Lmna/ (C) littermates. Sections were stained with Hematoxylin. In the corresponding insets, the whole testes are also shown for comparison. (D-F) Apoptotic cells are revealed by TUNEL, which was performed on sections of testes from 31-day-old wild-type, heterozygous and Lmna/ littermates, respectively. These sections are counterstained with Methyl Green. Scale bars: 100 µm (2 mm in the insets).