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Fig. 7. The role of Ca2+ in K+-sensitive luminescence. Results are expressed as 200 s integrated luminescent response to stimulation by addition of indicated volume of low (7.5 µmol l-1) or high (108 µmol l-1) [K+] solutions. (A) K+ stimulation following 40-50 min treatment with 5 µmol l-1 BAPTA-AM (open bar) or control solution (filled bar) (N=5-6 for each treatment/stimulus combination tested). (B) K+-stimulation of Ca-free cell suspensions with (filled bar) or without (open bar) simultaneous replacement of Ca2+ in stimulating solution (N=5 for each stimulus tested). n.d.=not determined. Values are means ± S.D.





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