In addition to glucose, brain cells also need the amino acid phenylalanine to move from the blood and across the blood brain barrier. Brains cells use phenylalanine to produce the neurotransmitter dopamine. Phenylalanine is transported from the blood and into the endothelial cells of the blood brain barrier through the transport protein LAT1, which uses energy to facilitate the movement. In a healthy brain, where is there a higher concentration of phenylalanine?   a) In the blood   b) In the endothelial cells of the blood brain barrier

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