AUTHOR=Ashworth Edward T. , Ogawa Ryotaro , Vera David R. , Lindholm Peter TITLE=Using 13N2 and PET to track in vivo nitrogen gas kinetics during normobaric conditions JOURNAL=Frontiers in Physiology VOLUME=Volume 16 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2025.1556478 DOI=10.3389/fphys.2025.1556478 ISSN=1664-042X