SLC3A2 and Huntington disease: Other SLCs that have been associated with HD in different ways are bicarbonate transporter-related protein 1 (BTR1, SLC4A11) [157], sodium-hydrogen exchanger 1 (NHE1, SLC9A1) [158], organic cation/carnitine transporter 2 (OCTN2, SLC22A5) [159], phosphate carrier protein (PHC, SLC25A3) [160], SLC3A2 [160], sodium-dependent vitamin c transporter 2 (SVCT2, SLC23A2) [161], and zinc transporter 10 (ZnT10, SLC30A10) [162].