has primary input purine fermentation purine nucleobase catabolic process anaerobic purine nucleobase catabolic process https://github.com/geneontology/go-ontology/issues/28527 https://github.com/geneontology/go-ontology/issues/29511 GO:0019653 purine fermentation anaerobic purine base catabolism anaerobic purine base catabolic process anaerobic purine catabolic process The anaerobic chemical reactions and pathways resulting in the breakdown of purine nucleobases, yielding energy in the form of ATP. purine base fermentation