ArticleIssue Date2003CitationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.100, no.23, pp 13591 - 13596PublisherNATL ACAD SCIENCES
ArticleIssue Date2003CitationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.100, no.23, pp 13591 - 13596PublisherNATL ACAD SCIENCES