Low-barrier hydrogen bond powers long-range radical transfer in the metal-free ribonucleotide reductase - Abhishek Sirohiwal; Juliane John; Yury Kutin; Rohit Kumar; Federico Baserga; Vivek Srinivas; Hugo Lebrette; Maximilian C. Pöverlein; Ana P. Gamiz-Hernandez; Joachim Heberle; Müge Kasanmascheff; Martin Högbom; et al. (Proceedings of the National Academy of Sciences, 2026)