passages.id: split_5_test_3450_passage
passages.type: progene_text
passages.text: Using surface - enhanced laser desorption - ionization time - of - flight mass spectrometry ( SELDI - TOF MS ) , we measured the expression of 393 proteins in 39 human cancer cell lines ( JFCR - 39 ) , and combined it with our previously established chemosensitivity database to select for proteins whose expressions show significant correlations to drug sensitivities .