Assembly details 

This version was assembled from 2.05 million whole genome shotgun
(WGS) reads, of which 88.2% were in read pairs. The sequence reads
were generated at Washington University School of Medicine's Genome
Sequencing Center and the Sanger Centre (Hinxton, UK).  The Phusion
(Mullikin, J) assembler was used to assemble the WGS reads into
contigs based on overlap information, and then into supercontigs using
read pair information to cross gaps. These supercontigs were assembled
into mapped ultracontigs based on FPC fingerprint mapping (generated
at Washington University School of Medicine's Genome Sequencing
Center), with material from previously finished clones used to bridge
gaps. Using the sequence data to choose primers along major
ultracontigs, a genetic map (Ray Miller, Washington University School
of Medicine) was constructed which yielded 6 chromosomes.  The genetic
mapping data along with data from 1:1 elegans:briggsae orthologs were
used to refine ultracontigs and to order and orient the sequences
along the C. briggsae chromosomes.

Of the 108 megabase (Mb) genome, 89Mb of the sequence is ordered and
oriented along the chromosomes. An additional 12Mb is localized to a
specific chromosome but not ordered (and thus located in the _random
bin) leaving only 7Mb currently unassigned.

The N50 contig size in this assembly is 41 kb and the N50 supercontig
size is 1450 kb. Most genes should be complete. The sequencing centers
estimate that this whole genome shotgun assembly achieved 98% coverage
of the genome. We continue to refine the genetic map and plan to release
an updated genomic sequence.

The cb2 sequence and annotation data may be downloaded from the UCSC
Genome Browser FTP server or Downloads web page. The sequence data
carry specific conditions for use. The cb2 annotation tracks were
generated by UCSC and collaborators worldwide. See the Credits page
for a detailed list of the organizations and individuals who
contributed to the success of this release.