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Ishihara color plate for testing color blindness.
Three active forms of vitamin A: all-trans-retinol, -retinal, and –retinoic acid
Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus
Because vitamin A is stored in the liver, chicken liver is a potent source of this vitamin
Daily Recommendations of Vitamin D3
Experiments showing that long- or short-day plants flower in response to night length. Each horizont