?:definition
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Catalysis of the reaction: (6R)-6-(L-erythro-1,2-dihydroxypropyl)-5,6,7,8-tetrahydro-4a-hydroxypterin = (6R)-6-(L-erythro-1,2-dihydroxypropyl)-7,8-dihydro-6H-pterin + H(2)O. [EC:4.2.1.96, RHEA:11920]
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Catalysis of the reaction: a 10-formyltetrahydrofolate-4a-carbinolamine = H2O + a 10-formyldihydrofolate. [GOC:pz, PMID:18245455, PMID:20959559]
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