SLC7A13 and cystinuria: In mammals, transporters such as the heterodimeric amino acid transporter b0, +AT (SLC7A9), the cystine‐glutamate antiporter xCT (SLC7A11) and AGT‐1 (SLC7A13) play key roles in redox homeostasis and are implicated in various disorders including cancer and cystinuria (Nagamori et al. 2016; Sleire et al. 2015; Pereira et al. 2015; Banjac et al. 2008).