ATCHX1 (CATION/H+ EXCHANGER 1); monovalent cation:proton antiporter. similar to ATCHX2 (CATION/H+ EXCHANGER 2), monovalent cation:proton antiporter [Arabidopsis thaliana] (TAIR:AT1G79400.1); similar to hypothetical protein [Vitis vinifera] (GB:CAN74725.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO67417.1); contains InterPro domain Sodium/hydrogen exchanger; (InterPro:IPR006153)