Previous studies by our research group using the same PCP animal model as that of the present study, have reported a significant decrease in levels of ErbB4 expression in the prefrontal cortex of PCP treated rats at PN12 (−25%; P<0.05), which persisted, although slightly attenuated, into adulthood (−18%; P<0.01) [34]. Here, ERBB4 is linked to pneumocystosis.