** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. ** With a gun carried in the appendix ...

Chemoresistance of metastatic testicular tumors is thought to be mediated partly by the blood–testis barrier (BTB), which impedes delivery to the testis of certain cytotoxic agents. Little is known, ...

Ultrasound is produced by high frequency vibrations beyond the range of human hearing. The frequency of ultrasound is therefore greater than 20,000 hertz. Ultrasound, like audible sounds, is ...

Spermiation—the release of mature spermatozoa from Sertoli cells into the seminiferous tubule lumen—occurs by the disruption of an anchoring device known as the apical ectoplasmic specialization ...