Figure 1.

Differences in basal [Ca²⁺]_i levels between NHK and ADPKD cells depend on extracellular Ca²⁺. A) Summary graph of averaged changes of [Ca²⁺]_i in control and upon the application of Ca²⁺-free medium (5 mM EGTA, as noted by a bar on the top) in NHK cells (black trace) and ADPKD cells (gray trace). B) Summary graphs of basal [Ca²⁺]_i in NHK and ADPKD cells in the control and in Ca²⁺-free medium. Asterisk denotes significant decrease vs. NHK cells. *P < 0.05.