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Proceedings of the National Academy of Sciences of the United States of America, 1938 May . 24(5), 224-227.
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Proceedings of the National Academy of Sciences of the United States of America, 1921 Oct . 7(10), 299-303.
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Proceedings of the National Academy of Sciences of the United States of America, 1926 Sep . 12(9), 548-551.
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Proceedings of the National Academy of Sciences of the United States of America, 1924 Feb . 10(2), 57-60.
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Proceedings of the National Academy of Sciences of the United States of America, 1925 Jul . 11(7), 422-428.
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Proceedings of the National Academy of Sciences of the United States of America, 1924 Aug . 10(8), 346-348.
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Proceedings of the National Academy of Sciences of the United States of America, 1983 Jul . 80(14), 4590-4594.
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Proceedings of the National Academy of Sciences of the United States of America, 1919 May . 5(5), 163-166.
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Proceedings of the National Academy of Sciences of the United States of America, 1948 Nov . 34(11), 540-543.
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Proceedings of the National Academy of Sciences of the United States of America, 1928 Sep . 14(9), 701-706.
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