Detection by denaturing gradient gel electrophoresis of pncA mutations associated with pyrazinamide resistance in Mycobacterium tuberculosis isolates from the United States-Mexico border region. - McCammon MT; Gillette JS; Thomas DP; Ramaswamy SV; Rosas II; Graviss EA; Vijg J; Quitugua TN (Antimicrobial agents and chemotherapy, 2005)