Fig. 3. Effects of silica nanoparticles on expressions of regulators in testes of mice (A): effects of silica nanoparticles on the expressions of Sohlh1, cyclin A1, cyclin B1, CDK1, CDK2 on day 45 (B): effects of silica nanoparticles on the expressions of Sohlh1, cyclin A1, cyclin B1, CDK1, CDK2 on day 75. β-Actin was the internal control (C): relative densitometric analysis of the protein bands was carried out and presented (Mean ± S.E.).