Coverage of the Arabidopsis chromosome 1 with Brassica WGS sequences. The Brassica sequence data set that had been filtered to remove known organellar, ribosomal, and repeated sequences, including transposons, was searched against the five Arabidopsis chromosomes by using BLASTZ. Each sequence is represented only once at the location determined by its highest scoring cluster of BLASTZ alignments. Coverage is expressed on a nucleotide basis and calculated in 5-kb windows.