science

While JQ1 is not suitable as a treatment due to neurological side effects, it is known to interfere with a stage of meiosis called prophase 1. This allowed researchers to demonstrate, for the first time, that targeting meiosis can safely and reversibly shut down sperm production.

If developed for human use, this type of male contraceptive could be delivered as an injection given every three months or possibly as a patch to maintain effectiveness, Cohen said.