Objective To find the specific secretory proteins of Mycobacterium tuberculosis resistant to isoniazid.Methods The 7-day and 14-day cultures filtrates of a clinical isolate of isoniazid-resistant Mycobacterium tuberculosis and a clinical isolate of isoniazid-sensitive Mycobacterium tuberculosis growing in Middlebrook 7H9 were captured by weak cation exchange protein chip(WCX2) and detected by surface-enhanced laser desorption /ionization time-of-flight mass spectrometry(SELDI-TOF-MS).Differences were analyz...