generation of precursor metabolites and energy
   |__energy derivation by oxidation of organic compounds
       |__fermentation
           |__acetate ester metabolic process involved in fermentation
           |__acetyl-CoA fermentation to butanoate
           |__anaerobic amino acid catabolic process
           |   |__anaerobic catabolism of pairs of amino acids(+)
           |   |__anaerobic glycine catabolic process
           |   |__anaerobic L-alanine catabolic process
           |   |__L-glutamate catabolic process via 2-hydroxyglutarate
           |   |__L-lysine fermentation
           |__anaerobic purine nucleobase catabolic process
           |__D-xylose catabolic process to ethanol
           |   |__regulation of xylose catabolic process to ethanol(+)
           |__glucose catabolic process to lactate
           |   |__glucose fermentation to lactate and acetate
           |   |__heterolactic fermentation
           |   |__homolactic fermentation(+)
           |__mixed acid fermentation
           |__non-glycolytic fermentation
           |   |__anaerobic glycerol catabolic process(+)
           |   |__citrate catabolic process to diacetyl
           |   |__ethanol-acetate fermentation to butyrate and caproate
           |   |__glucose fermentation to lactate and acetate
           |   |__heterolactic fermentation
           |   |__L-alanine fermentation to propanoate and acetate
           |__pyruvate fermentation
           |   |__butanediol biosynthetic process
           |   |__pyruvate fermentation to acetate
           |   |__pyruvate fermentation to ethanol(+)
           |   |__pyruvate fermentation to propionate
           |   |__pyruvate fermentation via PFL
           |   |__pyruvate fermentation via PFOR
           |__regulation of fermentation
               |__negative regulation of fermentation(+)
               |__regulation of glucose catabolic process to lactate via pyruvate(+)
               |__regulation of xylose catabolic process to ethanol(+)