SAN FRANCISCO, Dec. 29 (UPI) -- U.S. researchers say studying electrical currents in sperm cells may offer hope to infertile couples but also may lead to an effective male birth control pill.
University of California, San Francisco, biologists Yuriy Kirichok and Polina Lishko have uncovered how progesterone -- a hormone involved in menstruation and embryo development -- switches on a sperm's internal electricity.