MAPK14 and Alzheimer disease: By measuring Mapk14 gene transcripts and p38‐MAPK proteins in CD11b+ brain cells from APPtgp38fl/flLysM‐Cre+/− and APPtgp38fl/flLysM‐Cre−/− mice, we found that the rate of LysM‐Cre‐mediated Mapk14 gene recombination in microglia of 9‐month‐old AD mice was ~45% (Figure S1a,d,e).