RBFOX3 and schizophrenia: Interestingly when the expression of doublecortin in the cortex of schizophrenia cases was low the IWMN density was high underneath the cortex in schizophrenia cases.111 Meanwhile, Yang, et al.56 observed a number of SST+ IWMNs that did not express NeuN and suggested that these IWMNs may be immature neurons.