x1 = X_1_EGFR
x2 = X_4_EGFR_EGFR
x3 = X_2_ErbB3
x4 = X_6_ErbB3_ErbB3
x5 = X_5_EGFR_ErbB3
x6 = X_3_MET
x7 = X_7_MET_MET
x8 = X_10_p_MET_MET
x9 = X_8_p_EGFR_ErbB3
x10 = X_9_p_ErbB3_ErbB3