Simultaneously, ME rB exhibited cross resistance to DL methionine, as well as Threonine, Lysine, Isolecine, and Leucine separately or combinedly.

Objective To probe the clinical evaluation of tumor specific growth factor(TSGF), carbohydrate 19-9(CA19-9) and carbohydrate 242(CA242) combinedly in detecting malignant tumors in digestive tract.