scientists have mended broken hearts using a blood hormone (GDF 11) that makes ageing hearts in mice younger. The researchers merged the circulatory systems of young and old mice and realised that after 4 weeks of being exposed to the 'young blood', the old hearts became smaller and had a more youthful appearance. The hormone could eventually be used to treat human age-related diseases, such as stiffening and thickening of the heart muscles.
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