Unknown substrate

putative RND efflux transporter, membrane fusion protein subunit (RefSeq)
multidrug transport protein, acriflavin resistance protein F (RND family) (RefSeq)
putative HlyD family secretion protein precursor; putative efflux transporter, membrane fusion protein subunit precursor (RefSeq)
water channel (aquaporin Z) (MIP family) (RefSeq)