CASP3 and tuberculosis: As shown in Fig. 5f, the relationship of gray value ratios of caspase-3/GAPDH in TB@PMP (+), PMP (−), TB@PMP (−), TB@PM (+), and TB@PM (−) treated cells were about 0.713, 0.482, 0.418, 0.476, and 0.266, respectively.