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Fig. 1. HPLC analysis of blood of rats. (A) 1-year-old normally fed rats; (B) 1-year-old retinoid-deficient rats. Arrows indicate retinol peak. The amount of retinol in the normally fed rat is 665 ng/ml blood; in the retinoid-deficient rat no retinol could be detected. Similar data were obtained from four other control rats and seven retinoid-deficient rats.