SLC1A4 and schizophrenia: Since nominally significant single-marker and haplotype associations with schizophrenia were observed in the Screening Sample Set, we genotyped the Full-size Sample Set for the SNPs involved in the significance, SNP2, SNP3 of SLC1A4 and SNP1, SNP2, SNP4 of SLC6A5 to examine these significant associations in the Full-size Sample Set.