Vasalgel, a reversible form of male birth control, just took one step closer to your vas deferens.
Vasalgel, a reversible, non-hormonal polymer that blocks the vas deferens, is about to enter human trials.
vas deferens vas def·er·ens (vās' děf'ər-ənz, -ə-rěnz')
n. pl. vasa def·er·en·ti·a (děf'ə-rěn'shē-ə)
The main secretory duct of the testicle, through which semen is carried from the epididymis to the prostatic urethra, where it ends as the ejaculatory duct. Also called deferent duct, spermatic duct, spermiduct.