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(A) MMP secretion levels vary across cell lines. Lung cancer cell lines (A549 and HCC827) and prostate cancer cell lines (VCaP, LnCaP, and PC3) secrete varying levels of MMPs. Only droplets with single viable cells were measured, and intensity was normalized as a ratio of empty drop levels. (B) Lung cancer cells were interrogated for MMP secretion at 3 and 20 h.
