PACE transporters, including the chlorhexidine efflux transporter AceI, average about 140 amino acids in length and consist of two tandem homologous domains described by Pfam model PF05232. PACE transporters are single component efflux transporters that sit in the plasma membrane and couple proton import to substrate export.
Jiyao W et al.(2023). "The conserved domain database in 2023.",