NRG1 and schizophrenia: Block 1 contained four of the Icelandic schizophrenia-risk haplotype (HapICE) SNPs (rs73235619, rs35753505, rs62510682, rs6994992) along with two other SNPs (rs4281084 & rs7014762) in the 5'-region and Block 2 included four SNPs (rs3924999, rs2439272, rs2954041, rs74942016) in the 3'-region of NRG1. Examination of these haplotypes, as well as each SNP, independently revealed several nominal NRG1 isoforms and protein expression quantitative trait loci but none survived correction for multiple comparisons (Supplementary Table S8).