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(Left, Ourisson and Nakatani 1994) Hypothetical mechanism of the reinforcement of lipidic membranes by cholesterol, hopanoids, α, ω-dipolar carotenoids, and bis(diphytanylglyceryl) phospholipids. (Right) Structure and molecular dimension of three membrane reinforcers: cholesterol, bacteriohopane tetrol, bacterioruberine
