Figure 2

BAC end sequence (BES) categorization results based on the BLAST search. We defined a BLAST hit with ≥ 99% identity and > 0.8 alignment coverage, defined as the ratio of alignment length to BES length, as a match. BES+ denotes a BES with a single match, and BES++ a BES with multiple matches. BES- denotes a BES without a match, and BES-- a BES without a "raw BLAST hit."