To analyze the protein expression in Eomecon chionantha Hance roots with the proteomics approach, all proteins were extracted and separated by two-dimensional gel electrophoresis(2-DE), and stained with coomassie brilliant blue G250 to produce a high resolution and reproducible 2-DE image. Protein spots select-ed from this image were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and tandem mass spectrometry ( MALDI-TOF-TOF ) . The mass spectrometric data were used to identify the proteins through searches of the IPI protein sequence database. A tota...