ALDH1A1 and Parkinson disease: In the rotenone‐treated A53T PD mouse model, AEP was robustly activated and correlated with heightened expression of fragmented Sox6 and ALDH1A1, as well as reduced expression of full‐length Sox6 and ALDH1A1, in comparison to WT mice (Figure 2J,K; Figure S6A–E, Supporting Information).