Figure 4 Profile of Meiotic Arrest in Dmrt7 Mutant Testis Graph of distribution of meiotic stages of germ cells from heterozygous (n = 1,970) and homozygous mutant (n = 2,084) P26 testes, spread and stained for the synaptonemal complex protein SYCP3 to permit precise staging, which was performed as described [64,65].