Pacific Biosciences stated they may not release their second-generation machine capable of a US$1,000 genome until 2013. Complete Genomics, however, stated that they will be able to provide a US$5,000 full genome sequencing service by the summer of 2009. Complete Genomics demonstrated in a peer-reviewed paper that was published online in "Science" in Nov. 2009 that it could sequence a human genome for a consumables cost of approximately US$1700. The accuracy and completeness of these systems is a critical issue.