The NCAA changed its participation policy for transgender athletes on Thursday, limiting competition in women’s sports to athletes assigned female at birth only.

Of the more than 500,000 NCAA student-athletes, fewer than 10 of them are trans, according to NCAA President Charlie Baker.

The NCAA, the governing body for US collegiate sports, has issued a new policy that limits competition in women's sports to only student-athletes assigned female at birth. Announced on Thursday, the National Collegiate Athletic Association said its policy applied to all athletes and was effective immediately.