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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 D03 Heterocyclic Compounds D006571 +
 D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
 D03.549.909 Tetrapyrroles D045725 +
 D03.549.909.437 Corrinoids D045728 +
 D03.549.909.437.777 Vitamin B 12 D014805 +
 D03.549.909.437.777.560 Hydroxocobalamin D006879