RBFOX3 and Alzheimer disease: The number of NeuN+ cells per mm2 was significantly reduced in both the lateral entorhinal cortex (LEC, 13.4 ± 0.7), and somatosensory cortex (S1, 15.3 ± 1.1) in 5XFAD mice compared with wild‐type littermates (LEC: 20.7 ± 0.6; S1: 20.5 ± 1.2), confirming overall neuronal loss during AD progression.