MMP1 and pulmonary tuberculosis: The contribution of the -1607 MMP-1 genotype 2G/2G to the expression of active pulmonary TB might also be population-specific since the frequency of the allele 2G in Caucasians (0.433) and non-Caucasian Africans (0.375) is lower than in Mexicans (0.73) and Peruvians (0.71) (Table 2) [54].