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Isc was measured in sets of confluent cultures of L/+, L/L, m/m and +/+ CCDs counterparts grown on filters before (open symbols) and after sequential apical additions of 10−7m, 10−6m and 10−5m amiloride (filled symbols). The bars represent Ams Isc values measured after adding 10−5m amiloride. Values are means ± s.e.m. from five to ten separate filters in each condition tested. ** P < 0.01, *** P < 0.001versus+/+ values.
