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Bony fish like the tiny zebrafish have a remarkable ability that mammals can only dream of: if you lop off a chunk of their heart they swim sluggishly for a few days but within a month appear perfectly normal. How they accomplish this — or, more importantly, why we can’t — is one of the significant questions in regenerative medicine today.

Zebrafish study with human heart implications: Cellular grown-ups outperform stem cells in cardiac repair