Researchers have found a solution for a common form of male infertility. Nonobstructive azoospermia is a condition in which sperm do not grow to maturity.

Japanese researchers have now reported a way to extract immature sperm from the testicle and use it for in vitro fertilization. They are using it successfully at a clinic in Kitakyushu.

The team was headed by Atsushi Tanaka, founder of the clinic, Saint Mother Hospital. The researchers say it resulted in 112 births between September 2011 and December 2014.