TARDBP and Alzheimer disease: In spinal cord urea fractions the smaller molecular weight bands at 35 kDa and 25 kDa were less prominent and the CTF‐25 to full‐length TDP‐43 ratios unaltered between ALS and CTL, PD, and AD (p = 0.08, p = 0.17, and p = 0.053) (Figure 1C).