P4‐135: NATIVE GEL OVERLAY WITH FRET SUBSTRATE AND MS OF IN‐GEL DIGESTED ACTIVE BANDS SHOW THAT CALPAIN‐2 IS RESPONSIBLE FOR TAU CLEAVAGE AT AMINO ACID 224. (1st July 2019) - Cicognola, Claudia; Becker, Bruno; Brinkmalm, Gunnar; Zetterberg, Henrik; Blennow, Kaj; Höglund, Kina