Figure 2.

A disguised instance where sequence join alone holds together a supercontig. A long supercontig (blue) from one part of the genome subsumes a small foreign inset (red) from a completely different part of the genome, held together by a single point of attachment within a contig (bicolor): in fact only a sequence join ties blue to red. This was not recognized in the version of the code which produced the released mouse assembly (Mouse Genome Sequencing Consortium 2002). Resolution: break at the bicolor juncture, move the red sequence to where it links in another supercontig.