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Rearrange the parts into a correct sentence: P: found that allergic reactions are brought about Q: in the bloodstream R: in the 1940s S: by the liberation of small quantities of a substance called histamine

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Rearrange the parts into a correct sentence: P: found that allergic reactions are brought about Q: in the bloodstream R: in the 1940s S: by the liberation of small quantities of a substance called histamine
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