January 2006
10.1371/journal.pcbi.0020005
10.1371/journal.pcbi.0020002
10.1371/journal.pcbi.0020004
10.1371/journal.pcbi.0020008
10.1371/journal.pcbi.0020007
10.1371/journal.pcbi.0020003
10.1371/journal.pcbi.0020001
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