. "\"The chemical reactions and pathways resulting in the breakdown of citrulline, N5-carbamoyl-L-ornithine, an alpha amino acid not found in proteins.\" [ISBN:0198506732]" . . "citrulline catabolic process" . "citrulline breakdown" . "citrulline catabolism" . "citrulline degradation" . "MetaCyc:CITRULLINE-DEG-PWY" . . . . .