Rare stem cells in testis that produce a biomarker protein called PAX7 help give rise to new sperm cells, and may hold a key to restoring fertility, research by scientists at UT Southwestern Medical Center suggests. Researchers studying infertility in mouse models found that, unlike similar types of cells that develop into sperm, the stem cells that express PAX7 can survive treatment with toxic drugs … Continue reading Scientists discover cancer treatment resistant sperm stem cells in testis.