Buddy system. Young blood helps old muscle heal.
Beckman
Mary
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D000367:Age Factors; D000375:Aging / Q000378:metabolism / Q000502:physiology; D000818:Animals; D001769:Blood / Q000378:metabolism*; D001790:Blood Physiological Phenomena; D051379:Mice; D009132:Muscles / Q000293:injuries* / Q000378:metabolism*; D014945:Wound Healing / Q000502:physiology*