MCOLN2 and glioblastoma: Next, the expression of TRPML2 mRNA in 16 undifferentiated GSC lines (GSC#1#, GSC#10, GSC#23, GSC#28, GSC#30, GSC#61, GSC#62, GSC#67, GSC#68, GSC#70, GSC#74, GSC#76, GSC#83, GSC#169, GSC#181 and GSC#195) derived from GBM patients [22] (Table S1) was evaluated by quantitative RT-PCR (Figure 1B).