细胞生物学和生物化学 Cell Biology and Biochemistry
它们引起了细胞内的生物化学变化，并最终改变了大脑回路中对愉快的经历和记忆的反应方式。
They trigger intracellular biochemical events that eventually modify brain circuits that mediate the experience and memory of pleasure.
包括来自于“底层”的物理和化学因素，也就是分子间的作用，影响了上层的基因、染色体、细胞、组织和生物体。
They include constraints imposed "from below" by physics and chemistry, that is, from molecular interactions upwards, through genes, chromosomes, cells, tissues and organisms.
这种细胞的生物化学运作过程和普通生命完全一样——从DNA到RNA再到蛋白质，但它与手性对应的地球生命可能完全不相容。
Its biochemistry would work just like ours-dna to RNA to proteins-but it would be completely incompatible with earthly life, its chiral twin.
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