MENLO PARK, Calif., Nov. 6, 2012 (GLOBE NEWSWIRE) -- Pacific Biosciences of California, Inc. (Nasdaq:PACB) provider of the PacBio® RS High Resolution Genetic Analyzer, today announced the latest enhancements to its DNA sequencing system, the XL release featuring new chemistry and software for extraordinarily long read lengths that average 5,000 bases.