The high laevorotation of L-cystine depends on a specially helical structure of its molecular.
指出了L-胱氨的左旋性是由其分子的特殊螺旋结
决定的。
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Dopamine itself can't cross the blood-brain barrier, but its precursor levodopa can, and once in the brain, levodopa is converted to dopamine by dopa decarboxylase, most importantly within the remaining nigrostriatal neurons.
多巴本身不能通过血脑屏障,但它
前体左旋多巴可以,一旦进入脑中,左旋多巴就会被多巴脱羧酶转换为多巴
,尤其是
残存
黑质纹状体神经元内。