1K3F:
reference: Atomic structure at 2.5 A resolution of uridine phosphorylase from E. coli as refined in the monoclinic crystal lattice., Morgunova EYu, Mikhailov AM, Popov AN, Blagova EV, Smirnova EA, Vainshtein BK, Mao C, Armstrong ShR, Ealick SE, Komissarov AA, et al., FEBS Lett 1995 Jun 26;367(2):183-7. PMID: 7796917

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