The postmortem time was not significantly different for the AD and non-AD brain samples used in this study (non-AD: n = 13, AD: n = 12, p = 0.8066), and no significant decrease in HCN1 levels related to postmortem time was observed (n = 25, r = −0.2416, p = 0.2446) (Figure 6C and Table 1). Here, HCN1 is linked to Alzheimer disease.