Spatially nonuniform changes in intracellular calcium ion concentrations

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Science  20 Apr 1984:
Vol. 224, Issue 4646, pp. 292-294
DOI: 10.1126/science.6710144


The spatial variation of changes in intracellular calcium ions were studied with a one-dimensional scanning microphotometer. Changes in intracellular calcium were measured with a metallochromic dye, arsenazo III. Both the magnitude and the kinetics of changes in calcium were dramatically different in different regions of a cell. In Limulus ventral photoreceptors the maximum change was probably restricted to the rhabdomeric lobe.