PPP1CA and meningioma: Sequence analysis of the Merlin NTD showed a phosphorylation site on serine 13 (S13) within consensus motifs for a kinase (PKC) and a phosphatase (PP1A) that are core components of the Wnt pathway and were also identified in proximity to MerlinFLAG-APEX2 constructs in meningioma cells (Supplementary Data 2).