SLC7A9 and cystinuria: A spontaneous cystinuria murine model has also recently been described (129S2/SvPasCrl) (p.Glu383Lys in SLC3A1) and 3 knockout murine models (C3HeB/FeJ-MRL/MpJ, 129P2/OlaHsd-57BL/6J) (p.Asp140Gly in SLC3A1, disruption of exon 3 to 9 in in SLC7A9, compound heterozygotes of the two variants [C3HeB/FeJ/MRL/MpJ-129P2/OlaHsd/57BL/6J]) have been generated [10,22–24].