L-Uridine, isolated from the Polyporaceae fungus Poria cocos (Schw.), is an enantiomer of the normal RNA constituent D-uridine. L-uridine acts as a phosphate acceptor for nucleoside phosphotransferases[1].

[1]. A F Wu, et al. L-uridine: synthesis and behavior as enzyme substrate. Proc Natl Acad Sci U S A. 1969 Aug;63(4):1222-6. [2]. Yumei Wang, et al. Chemical Composition and Pharmacology Research Progress of Shenlingbaizhu Powder. 2019 Asia-Pacific Conference on Clinical Medicine and Public Health.

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