AUTHOR=Wang Fei , Du Runyu , Shang Yunxiao TITLE=Biological function of d-tryptophan: a bibliometric analysis and review JOURNAL=Frontiers in Microbiology VOLUME=15 YEAR=2025 URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2024.1455540 DOI=10.3389/fmicb.2024.1455540 ISSN=1664-302X