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Profiles of the oxygen transport parameter across the phospholipid–cholesterol domain (PCD) of cortical and nuclear lens-lipid membranes of clear (a) and cataractous (b) human lenses obtained at 37 °C with phospholipid-type and cholesterol-type spin labels, and across the CBD with cholesterol-type spin labels. Approximate locations of the nitroxide groups of spin labels are indicated by arrows
