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After this article  appeared online, an error was called to our attention. The "universal probe" sequence
UPL #149 in Table 6 appears with the 5' and 3' ends reversed. The correct sequence
of this locked nucleic acid (LNA) probe is 5'-TCGCCGCC-3'. This typographical error
does not affect any of the conclusions drawn in the article.
White RA, Blainey PC, Fan HC, Quake SR: Digital PCR provides sensitive and absolute calibration for high throughput sequencing.