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1: Nature. 1999 Jan 21;397(6716):195-200.Click here to read Links
Comment in:
Nature. 1999 Mar 18;398(6724):186.
Nature. 1999 Mar 18;398(6724):186.
Nature. 1999 Mar 4;398(6722):20.

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PMID: 9930685 [PubMed - indexed for MEDLINE]