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Expression of TREK-TRAAK K2P channel family members (TREK-1, TREK-2 and TRAAK) in human retinal pigment epithelium cells. TREK-TRAAK K2P channels were labeled with Alexa Fluor 555-conjugated antibodies (red), and nuclei were labeled with Hoechst 33342 (blue). Sand-like distribution of channels was observed (scale bar, 10 μm). K2P, two-pore domain potassium.
