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Freeze fracture electron microscopy of the L3 containing (a) SERCA1a at 2.5 μM and (b) BR at 5.0 μM. The image represents the midplane of the bilayers of the sponge phase and the spots pointed by the arrows represent the replica of SERCA and BR proteins embedded in the bilayer. The stars point out to the region of the phase devoid of proteins.
