Fig. 1. Effects of continuous exposure to 4.9 GHz RFR for 21 days on the general health of mice: (a) body weight of mouse; (b) testis weight; (c) testis coefficient; data are expressed as Mean±SD, n=12

Fig. 2. Effects of continuous exposure to 4.9 GHz RFR for 21 days on the morphological structure of seminiferous tubules in testis tissue of mice: (a) HE staining results of testis tissue, n=3; (b) diameter of seminiferous tubules; (c) thickness of seminiferous epithelium

Fig. 3. Effects of continuous exposure to 4.9 GHz RFR for 21 days on epididymal morphology and sperm quality in a mice: (a) HE staining of epididymal tissue, n=3; (b) sperm count; (c) sperm abnormality rate

Fig. 4. Effects of continuous exposure to 4.9 GHz RFR for 21 days on serum sex hormones in adult male C57 mice: (a) testosterone content; (b) FSH content; (c) LH content; (d) GnRH content, *p<0.05 vs. Sham; **p<0.01 vs. Sham; data are presented as Mean±SD, n=11~12

Fig. 5. Effects of continuous exposure to 4.9 GHz RFR for 21 days on the secretory function of sertoli cells in mice: (a) GDNF concentration; (b) SCF concentration; data are presented as Mean±SD, n=6

Fig. 6. Effects of continuous exposure to 4.9 GHz RFR for 21 days on the secretion of related proteins from sertoli cells in mice: (a) representative results of Western blot; (b) relative expression of GDNF; (c) relative expression of SCF; data are presented as Mean±SD, n=3

Fig. 7. Effects of continuous exposure to 4.9 GHz RFR for 21 days on blood-testis barrier tight junction-related proteins in mice: (a) representative bargraphs of Western blot; (b) ZO-1 gray value; (c) occludin gray value; data are expressed as Mean±SD, n=3