MAPT and Alzheimer disease: Acetylations were only half as frequent as phosphorylations in these aggregates, but were likewise enriched in samples derived from AD relative to NC: 3.3‐fold after Aβ‐IP, 2.8‐fold after tau‐IP (2‐ and 1.7‐fold with adjustment for aggregate quantities; each P < 0.005), but <1.3‐fold in total large aggregates (Table 1, last 4 rows).