PMC:1892049 / 31628-31754 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/1892049","sourcedb":"PMC","sourceid":"1892049","source_url":"http://www.ncbi.nlm.nih.gov/pmc/1892049","text":"A previous version of this article appeared as an Early Online Release on May 16, 2007 (doi:10.1371/journal.pgen.0030108.eor).","tracks":[]}