Although expression of PHOX2B (PMX2B/ARIX), which has been implicated in both strabismus and schizophrenia (Toyota et al., 2004), was reduced to 50% in the muscles from patients with strabismus, this reduction was not statistically significant in our data set (p = 0.13, n = 4). Here, PHOX2B is linked to schizophrenia.