Antiporters. Anion Exchangers (Proteins) . Cation Exchangers (Proteins) . Exchange Proteins, Anion . Exchange Proteins, Cation . Anion Exchange Proteins . Cation Exchange Proteins . ANION EXCHANGERS . Membrane transporters that co-transport two or more dissimilar molecules in the opposite direction across a membrane. Usually the transport of one ion or molecule is against its electrochemical gradient and is "powered" by the movement of another ion or molecule with its electrochemical gradient. . 1.00