Last month, the server's managers created q-bio, an archive for quantitative biology. The move reflects the fact that ArXiv's traditional constituency of physicists, mathematicians and computer scientists is increasingly working on biological problems, says its founder Paul Ginsparg of Cornell University in New York state.

The proportion of biology papers on ArXiv has been growing steadily, reaching 8% of the 4,500 submissions received last year. But until now, these papers have been scattered across various subdisciplines on ArXiv. The new arrangement will regroup existing content, and provide a dedicated area for quantitative biology.

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