In addition, there were no differences in surface or intracellular GluA1 or GluA2 protein expression between obesity-prone and obesity-resistant females fed a chow diet (data not shown; GluA1: surface p = 0.9; intracellular p = 0.45: GluA2: surface p = 0.9; intracellular p = 0.11). This evidence concerns the gene GRIA1 and obesity due to melanocortin 4 receptor deficiency.