RBFOX3 and type 2 diabetes mellitus: It was interesting to note in this study that QUIN+ expression in human T1D retinas was significantly higher than that in T2D retinas (Fig. 4), whereas the density of NeuN+ neurons in human T1D retinas was significantly lower than that in T2D retinas (Fig. 7), which suggests that the loss of NeuN+ neurons may be related to the increased QUIN+ expression in human diabetic retinas.