DNA was collected from peripheral blood using a QIAamp DNA Blood Kit (Qiagen, Tokyo, Japan). To detect the rs53576 of the OXTR gene, TaqMan SNP Genotyping Assay (C_3290335_20; Thermo Fisher Scientific) and TaqPath Master Mix (Thermo Fisher Scientific) were used. For this study, the OXTR genotypes were divided into two groups: A allele carriers (A/A + A/G) and A allele noncarriers (G/G), according to earlier meta‐analyses showing that the A allele is dominantly related to sociality (Li et al., 2015 (link)) and empathy (Gong et al., 2017 (link)).
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