Lab-grown mini-hearts beat 'just like the real thing' in huge scientific breakthrough

dailystar.co.uk:

Science magazine: "When I saw it the first time, I was amazed that these chambers could form on their own. "The amazing thing is that you see immediately whether the experiment worked and the organoid is functional, since it beats - unlike other organs."Stem cell scholars have spent years trying to construct organs that mimic the rhythms of the human body.These minihearts, which spent more than 3 months in a lab and took a week to copy the structure of a 25-day-old embryo, could be a groundbreaking step forward for science.They include all the cell types expected in hearts at just over three weeks of development, including essential cardiomyocytes, epithelial cells, fibroblasts, and epicardium.The minihearts also have self-defined chambers.