Elderly people with frailty, which affects up to one-quarter of over-50s, increased their endurance after a single dose of stem cells.
"We know that's all going to change," he said.
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When she received a phone call saying a womb had been donated and a transplant was possible, Bell remembers being "in complete shock" and "really excited".
Mum Toni Green, 54, adds: "You don't know whether the surname will help or hinder.