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Addition of exogenous retinoids to mouse liver before homogenization to show 9cROL is not formed artifactually. Left panel of each pair is a magnified view of the right panel to show 9cROL more clearly. (A) Addition of 9cROL increases 9cROL only. (B) Addition of atROL increases atROL only. (C, D) Addition of either 9cRAL or atRAL does not increase either 9cROL or atROL.
