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    Academic Journal

    Source: Proceedings of the National Academy of Sciences of the United States of America, 1993 Apr . 90(8), 3675-3679.

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    Academic Journal

    Source: Proceedings of the National Academy of Sciences of the United States of America, 1984 Aug 01. 81(15), 4988-4992.

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    Academic Journal
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    Academic Journal
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    Academic Journal
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    Academic Journal
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