Any one observing him would have seen a change in his complexion, in the adjustment of his facial muscles, in the vividness of his glance, which might have made them imagine that every molecule in his body had passed the message of a magic touch.
There are no more uses of "molecule" in the book.
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They say they can genetically engineer bacteria or yeast to produce whatever molecules they need to replace gasoline.
That protein molecule is found in lower concentrations in the brains of people suffering ordinary age-related memory loss.