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PubMed Central (PMC) changed its policy in two areas that make it more attractive to publishers to participate. Firstly the strict requirement for publishers to have their full text hosted on the PMC site - as distinct from their own- is now waived and PMC will provide a link to a journal site. Secondly, for those who do deposit their data with PMC, a copy of this data is available on request at no cost, and in parallel a project is well underway to digitize back issues – a solution to long term archiving? The result has been growth in the number of PMC journals from an initial 8 to over 100 by February 2004, and now just over 80 in January 2006. Note that more than 60 of these journals are from one Open Access publisher BioMed Central.
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