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Finding the Number

Raphael Kopan and his colleagues at Washington University in St. Louis write in Cold Spring Harbor Protocols about a pyrosequencing-based method to determine the copy number of any allele from any genome. Their approach, called reference query pyrosequencing, takes "advantage of the fact that pyrosequencing can accurately measure the molar ratio of DNA fragments in a mixture that differ by a single nucleotide," they write.

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Reuters reports that Germany is seeking to sequence 5 percent of patient samples that test positive for SARS-CoV-2.

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The publisher of the Science family of journals will allow some authors to place peer-reviewed versions of their papers into publicly accessible repositories.

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