Characteristics of the homology search of Illumina sequences against the Nr database.

<p>(A) Venn diagram of unigenes annotated by Blastx against five protein databases. (B) The species distribution is shown as a percentage of the total homologous sequences with an <i>E</i>-value of at least 1.0E^-5. (C) <i>E</i>-value distribution of BLAST hits for each unique sequence with a cut-off <i>E</i>-value 1.0E^-5. (D) Similarity distribution of the top BLAST hits for each sequence.