In order to enter a cell, an ammonium ion must first dissociate to form an ammonia molecule and a hydrogen ion (a proton), which then pass through the cell membrane separately and recombine inside.
Keywords: E. coli; SSME; Saccharomyces cerevisiae; ammonium transporter; biochemistry; chemical biology; nitrosomonas europaea; rhesus protein; transport selectivity.
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