Total proteins of HepG2 and SK-Hep–1 cells were identified by MALDI-TOF.

ND: None detected.The functional classification (Class) of identified proteins is shown a ~ m. a: cell cycle; b: chaperone/ stress response; c: cytoskeleton/ cell mobility; d: DNA replication/ gene regulation/ cell proliferation; e: ion channels; f: membrane proteins; g: metabolic enzyme; h: protection and detoxification; i: protein synthesis and degradation; j: signal transduction; k: transport/ binding proteins; l: intermediate filaments; m: unannotated/ function inferred.Total proteins of HepG2 and SK-Hep–1 cells were identified by MALDI-TOF.