NRG1 and schizophrenia: In addition, reverse transcription‐polymerase chain reaction (RT–PCR) analysis revealed elevated Nrg‐1 and ErbB4 mRNA expression in the phosphatidylserine emulsion‐treated group; high Nrg‐1 and ErbB4 expression levels are associated with better myelination (Liu et al., 2022), while Nrg‐1 gene knockdown in mice lead to schizophrenia‐like behavior (Cong et al., 2022).