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In collaboration with book publishers, NCBI is adapting books for the web and linking them to PubMed. The first book, Molecular Biology of the Cell by Alberts et al., is now available.			Use Preview/Index for advanced search options. Refine a search term-by-term from specific search fields, and preview the number of results before displaying the citations. See help for more information about this and other features of the new PubMed.