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Figure 8


Fig. 8. Proposed model for the two stages of light-induced TRPLchannel translocation. A diagram of a single photoreceptor cell with rhabdomere (R) and cell body (C) is shown. The apical (gray) and basolateral (orange) membranes are also indicated. Arr-2 is required for maintaining TRPL channels (green) in the rhabdomeres. During Stage 1, TRPL channels are released from the rhabdomere and translocate by lateral diffusion into the stalk membrane, where the channels are restricted to the apical membrane by the AJs (open circles). Stage 1 requires Rh1 and the effector PLC. In Stage 2, TRPL channels bypass the AJs and translocate to the basolateral membrane. Stage 2 requires Rh1, PLC, TRP and eye-PKC.





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