Cell lines studied Unique proteins in hydrophobic fraction Shared proteins by the two preparations Unique proteins in whole cell lysate MDAMB231 cells 251 141 4 MCF7 cells 230 116 6 T47D cells 170 120 13

Table 2: Comparison of proteins identified in the hydrophobic fraction and the whole cell lysate of three breast cancer cell lines by LTQ-Orbitrapmass spectrometry