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N50 contig size is the value X such that at least half of the genome is contained in contigs of size X or larger. N90 is the equivalent value at which 90% of the genome is covered by contigs of size X or larger.
aGene numbers were counted following the TAIR convention, that is, including the numbers of protein coding genes, transposable element (based on BLASTn with A. thaliana transposable elements) and noncoding RNA genes. ORF, open reading frame.