generation of precursor metabolites and energy
   |__energy derivation by oxidation of organic compounds
       |__cellular respiration  234 rec.
           |__aerobic respiration 230 rec.
           |   |__aerobic electron transport chain(+) 116 rec.
           |   |__aerobic respiration, using ammonia as electron donor
           |   |__aerobic respiration, using arsenite as electron donor
           |   |__aerobic respiration, using carbon monoxide as electron donor
           |   |__aerobic respiration, using ferrous ions as electron donor
           |   |__aerobic respiration, using hydrogen as electron donor
           |   |__aerobic respiration, using nitrite as electron donor
           |   |__aerobic respiration, using sulfur or sulfate as electron donor
           |   |__alternative respiration
           |   |__glycolytic process(+) 37 rec.
           |   |__oxidative phosphorylation(+) 143 rec.
           |   |__pyruvate decarboxylation to acetyl-CoA(+) 13 rec.
           |   |__regulation of aerobic respiration(+) 12 rec.
           |   |__tricarboxylic acid cycle(+) 50 rec.
           |__anaerobic respiration
           |   |__anaerobic electron transport chain
           |   |__anaerobic respiration, using ammonium as electron donor
           |   |__dissimilatory sulfate reduction
           |   |__methanogenesis(+)
           |__regulation of cellular respiration 13 rec.
           |   |__negative regulation of cellular respiration(+) 2 rec.
           |   |__positive regulation of cellular respiration(+) 8 rec.
           |   |__regulation of aerobic respiration(+) 12 rec.
           |__respiratory electron transport chain 120 rec.
               |__aerobic electron transport chain(+) 116 rec.
               |__anaerobic electron transport chain
               |__ATP synthesis coupled electron transport(+) 120 rec.
               |__chlororespiration
               |__plasma membrane electron transport, NADH to quinone