It is not resolved whether the anionic channel involved in volume regulatio
n after cell swelling comprises one or more subunits. Moreover, it remains
to be determined which of the different proteins cloned so far, for which a
n involvement in cell volume regulation has been postulated, is the ideal c
andidate. In this review, we consider the role of the ICln protein, cloned
from MDCK cells, in cell volume regulation.