Phosphorylation of the Retinal Ribbon Synapse Specific t-SNARE Protein Syntaxin3B Is Regulated by Light via a Ca^{2 +}-Dependent Pathway.

In cone terminals, the ability of the light stimulus to reduce the pSTX3 to STX3 ratio attained in the dark-adapted state under normal Ca 2+ conditions approached significance ( Figure 3C ; dark: 0.796 ± 0.074 vs. light: 0.445 ± 0.084; n = 4,4; p = 0.0551), possibly reflecting the greater ease with which isolated eyecups could be oriented to face the light stimulus relative to live mice.

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