However, for the plasma AVP neuropeptide, levels were significantly lower [F (1,55) = 6.564, p = 0.013)] in PWS (M = 3.142, SE= 0.064) compared to controls (M = 3.096, SE = 0.060) as depicted in the boxplot (Figure 1). The gene discussed is AVP; the disease is Prader-Willi syndrome.