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Blood from young animals can revitalise old ones

economist.com

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Re: Blood from young animals can revitalise old ones

#10
post #5

> ... older animals may also benefit from having their blood scrubbed by young kidneys and livers, which mere blood transfusion would not offer. What of transplant patients that receive a kidney or liver transplant from a younger donor?

I'd guess that side effects from the immunosuppressants that they have to take cancel out any positive effect. Also, typically you don't give organs to geriatric patients, they're too valuable, so any age difference won't be very large.
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