BETTERHUMANS: Mice with grafted testicle tissue have produced monkey sperm, a step towards preserving endangered primates and new reproductive options for infertile men.

Researchers from the University of Pennsylvania in Philadelphia and the University of California, Davis transplanted a small amount of testicular tissue from an immature rhesus macaque monkey into the skin of a mouse. The tissue matured and produced sperm.

Similar procedures could help preserve genetic material from endangered nonhuman primates that might die before reproducing and could help men rendered infertile by cancer treatments before they reach puberty.

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