tricarboxylic acid cycle obsolete tricarboxylic acid cycle intermediate metabolic process true tricarboxylic acid cycle intermediate metabolism citric acid cycle intermediate metabolism TCA intermediate metabolism This term was made obsolete because it is a grouping term that is not useful, but has caused true path violations. tricarboxylic acid cycle intermediate metabolic process Krebs cycle intermediate metabolic process citric acid cycle intermediate metabolic process TCA intermediate metabolic process OBSOLETE. The chemical reactions and pathways involving intermediates of the tricarboxylic acid cycle. GO:0006100 Krebs cycle intermediate metabolism biological_process citrate metabolic process 2-oxoglutarate metabolic process succinyl-CoA metabolic process succinate metabolic process fumarate metabolic process oxaloacetate metabolic process malate metabolic process