CAPNS1 and meningioma: Overall, these data show that all the patient-derived GSC cultures contain similar protein amounts of Calp-1, Calp-2, CSS1 and total cast (excluding hcast 3-25) but, as previously observed in human meningioma tissues (De Tullio, et al., 2018), each culture is characterized by a specific ratio of native vs. autoproteolyzed Calp-1 species reflecting the heterogeneity of the original GBM.