Protein also contains leucine , an amino acid that prevents muscle loss when you 're dieting .
蛋白质中含有亮氨酸，这是一种氨基酸能在你节食的时候阻止肌肉消失。
The two missing links in the chain ( a phenylalanine and a leucine , for aficionados ) are encoded in the gene for ordinary tomcod ahr by six genetic " letters " that are missing from the dna found in pcb-resistant hudson tomcod .
