AUTHOR=Bruegmann Tobias , Smith Godfrey L. , Lehnart Stephan E. TITLE=Editorial: Cardiac optogenetics: Using light to observe and excite the heart JOURNAL=Frontiers in Physiology VOLUME=13 YEAR=2022 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2022.1031062 DOI=10.3389/fphys.2022.1031062 ISSN=1664-042X