Plants contain a different form called β-carbonic anhydrase, which, from an evolutionary standpoint, is a distinct enzyme, but participates in the same reaction and also uses a zinc ion in its active site.
Planter har en anden form kaldet β-kulsyreanhydrase, som, fra et evolutionært synspunkt, er et særskilt enzym, men deltager i samme reaktion og også bruger en zinkion i dets aktive site.