HPGDS and atrial fibrillation: In contrast, when we examined the expression of three glutathione S-transferase (GST) proteins, which have been reported to correlate with AF production (Ziglari et al., 2008), we observed that GST C-terminal domain-containing protein (B8NBY8) and glutathione S-transferase GstA (B8N3U8) were down-regulated.