Retinol and retinyl esters but not ATRA or RAL were detected in the livers (A, B) and spleens (C, D) of control (left column) and vitamin A-supplemented (right column) mice. The results from one representative mouse per group and tissue are shown. Tissue sample weights are as follows 128.0 mg (A), 101.0 mg (B), 150.0 mg (C), 137.0 mg (D). Note y-axis scale differences between (A, B) and (C, D).