Figure 2 shows that KMO protein was expressed in A172, LN18, and U373 cells, with A172 cells expressing more KMO protein than the other cell lines, which corresponds to the results in Figure 1D. Our results on GBM cell lines demonstrate that KMO is expressed and active in GBM malignant cells, but both mRNA and protein expression as well as KMO activity differ among the GBM cell lines. Here, KMO is linked to glioblastoma.