Occurs preformed only in animals; metabolized from carotenoids, such β-carotene, in the intestinal mucosa. Dietary sources include liver, milk, butter, cheese, eggs and fish liver oils or as carotenois from fruits and vegetables. Stored primarily in the l
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参考文献
• Davis, M., et al.: J. Biol. Chem., 15, 167 (1913)
• Crouch, R.K., et al.: Photochem. Photobiol., 64, 613 (1913)