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  • exchange
  • The System A transporter (SA1) and SN1 share many functional characteristics, including a marked sensitivity to low pH, but, unlike SN1, SA1 does not mediate proton exchange. (pnas.org)
  • Consistent with this sensitivity, we found that the System N transporter (SN1) mediates proton exchange as well as Na + cotransport ( 26 ). (pnas.org)