AUTHOR=Chen Yao , Saulnier Jessica L. , Yellen Gary , Sabatini Bernardo L. TITLE=Corrigendum: A PKA activity sensor for quantitative analysis of endogenous GPCR signaling via 2-photon FRET-FLIM imaging JOURNAL=Frontiers in Pharmacology VOLUME=7 YEAR=2016 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2016.00046 DOI=10.3389/fphar.2016.00046 ISSN=1663-9812