MAPT and Alzheimer disease: Summing over all aggregate proteins, phosphorylations were 3.2‐ and 3.5‐fold more frequent within Aβ‐ and tau‐containing aggregates, respectively, from AD vs. NC samples (1.9‐ and 2.1‐fold after adjustment for aggregate quantities) but were scarcely elevated in total aggregates (P < 1E–7 by Fisher's exact tests).