Proposed rankings would classify genomes by completeness and quality.Scientists have proposed classifying genome sequences into six groups, based on their quality.A. Sumner / Science Photo Library Researchers who have mapped a species' genome need to be more explicit about the quality of their sequence, says an international team of genome researchers."People generating these sequences should discriminate a bit more between the products that they provide to the rest of the scientific community," says Patrick Chain of the Joint Genome Institute at the Los Alamos National Laboratory in New Mexico who is first author of a policy paper on genomic standards...