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The incubation of Delta(7)-cholestenol with a 10000g supernatant or 105000g microsomes in the presence of tritiated water is studied. The reisolated Delta(7)-cholestenol contained up to 0.67g.atom of tritium/mole. This result can best be explained by assuming the reversibility of the reaction Delta(8)-cholestenol right harpoon over left harpoon Delta(7)-cholestenol.

The reversibility of the Δ8-cholestenol–Δ7-cholestenol isomerase reaction in cholesterol biosynthesis