4Q49:
reference: Joint neutron crystallographic and NMR solution studies of Tyr residue ionization and hydrogen bonding: Implications for enzyme-mediated proton transfer., Michalczyk R, Unkefer CJ, Bacik JP, Schrader TE, Ostermann A, Kovalevsky AY, McKenna R, Fisher SZ, Proc Natl Acad Sci U S A. 2015 Apr 20. pii: 201502255. PMID: 25902526

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