Calcium ion, a putative intracellular messenger for light-adaptation in Limulus ventral photoreceptors.
Calcium ion fulfills several criteria for identifying an intracellular messenger for light-adaptation in Limulus photoreceptors. Direct injection of Ca++ mimicks two aspects of light-adaptation; sequestration of intracellular calcium tends to prevent light-adaptation; and light induces an increase in intracellular Ca++ as demonstrated by two independent techniques.
5 references, click to expand
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Effects of intracellular injection of calcium buffers on light adaptation in Limulus ventral photoreceptors.J Gen Physiol. 1975 Oct;66(4):489-506 PMID: 810540
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