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Fig. 2. The
MR cell. With this configuration of transport elements, both
Na+ and Cl can be absorbed from ambient NaCl, and
Cl can be taken up from Na+-free solution. As
pictured, it lacks a basolateral mechanism for eliminating
HCO3 and hence would be unable to absorb
Na+ from Cl-free media. Whether this is, in fact,
the case remains to be determined. The apical Cl channel is
not shown, since it would be closed in FW.