HTR2A and schizophrenia: Accordingly to the UniProt protein database, in mice, rats and humans, the expression of only one isoform of 5-HT1A, 5-HT2A and 5-HT2 has been identified, while in zebrafish the expression of two isoforms of each of these receptors has been observed1 (156), which indicates the necessity to compare the involvement of individual zebrafish isoforms in relevance to schizophrenia.