oxytocin450

On the left is healthy muscle tissue from a young mouse. The ability of muscle to repair itself decreases with age, as evidenced by the middle image of old muscle tissue, which shows a lower density of muscle fibers, increased scar tissue and inflammation. The addition of oxytocin to the blood of old mice rapidly rejuvenates the old muscle, which appears young again, as shown in the image on the right. (Photos by Wendy Cousin and Christian Elabd, UC Berkeley)

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