Figure 4.

Compared with the controls, hypocretin‐1 (Hcrt‐1) levels were significantly lower in the prefrontal cortex of the Huntington disease (HD) patients (Mann–Whitney U‐test (MWU): P = 0.025, left panel), but not in their cerebrospinal fluid (CSF) (MWU‐test: P = 0.306, right panel).