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Short applications of ACh (indicated by bars) trigger transient rises in CaM concentration in the SG region. In A the corresponding fall in the fluorescence from the basal nonnuclear region is barely resolved, whereas in B there is a clear decrease in the basal nonnuclear CaM concentration during the rise in the SG region. Relative changes of DTAF-CaM fluorescence in the nucleus (blue), SG region (red), and basal nonnuclear area (green) are shown.
