Research led by the Hubrecht Institute and the University Medical Center Utrecht has uncovered a key molecular mechanism that helps control heart regeneration in zebrafish. A protein known as leucine-rich repeat-containing 10 (LRRC10) acts as a switch to stop uncontrolled proliferation of cardiomyocyte cells when regeneration is complete. As reported in the May 18, 2023, issue of Science, lead author Jeroen Bakkers and colleagues found that the LRRC10 pathway was conserved in mouse and human cells.