AIF1 and Prader-Willi syndrome: Linear regression analysis revealed incidental significance for several parameters, including AVP‐ir soma number/mm3 and VIP‐ir soma number/mm2 versus BMI in controls: AVP‐ir soma number/mm and2 AVP‐ir O.D. versus age in controls; and Iba1‐ir % area masked versus BMI in PWS.