FOS and Alzheimer disease: O‐GlcNAc cycling is known to be altered in the brains of patients with AD (Forster et al., 2014; Liu et al., 2009; Wang et al., 2017; Zhu et al., 2014), and altered c‐Fos O‐GlcNAcylation caused by Aβ may be one of the consequences of disrupted O‐GlcNAc cycling.