Biotech Start-Up Claims Lab-Grown Sperm Could Help Infertile Men (Awaiting Validation)

Utah-based Paterna Biosciences says it has found a way to coax sperm-forming stem cells from testicular tissue to become mature, functional sperm in a lab and used this sperm to create embryos; the work has not yet been peer-reviewed or independently verified, and the company plans larger studies to compare lab-made and natural sperm in men with infertility before attempting pregnancies; if validated, the approach could offer a biological option for some infertile men, but questions of cost and safety remain.