Generation of a phospho-specific antibody recognizing MerlinpS13 (Supplementary Fig. 6i) showed small-interfering RNAs (siRNAs) suppressing PP1A increased MerlinpS13 immunoblot intensity but siRNAs suppressing PKCα and PKCγ decreased MerlinpS13 immunoblot intensity compared to non-targeted control siRNAs (siNTC) in meningioma cells (Fig. 3i, j). This evidence concerns the gene PPP1CA and meningioma.