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Sketch of a Müller cell alignment in the layers of Pied Flycatcher retina; OLM – Outer Limiting Membrane, ONL- outer nuclear layer, OPL- outer plexiform layer, INL- inner nuclear layer, IPL-inner plexiform layer, ILM-inner limiting membrane. Note the locations of the cross-sections of the electron microphotographs presented in the other Figures, marked by the figure numbers.
