protein metabolic process cellular macromolecule metabolic process cellular protein metabolic process GO:0044267 Reactome:REACT_101554 Reactome:REACT_102155 Reactome:REACT_105825 Reactome:REACT_106151 Reactome:REACT_108005 Reactome:REACT_109022 Reactome:REACT_17015 Reactome:REACT_32904 Reactome:REACT_34473 Reactome:REACT_80561 Reactome:REACT_81994 Reactome:REACT_82523 Reactome:REACT_85873 Reactome:REACT_86658 Reactome:REACT_89852 Reactome:REACT_91052 Reactome:REACT_93132 Reactome:REACT_96466 Reactome:REACT_99179 The chemical reactions and pathways involving a specific protein, rather than of proteins in general, occurring at the level of an individual cell. Includes cellular protein modification. biological_process cellular protein metabolism