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. 2012 Feb 13;7(2):e31168. doi: 10.1371/journal.pone.0031168

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Zhao et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) The four Chromosomes with the most number of SPI genes. Many SPI genes are in tandem clusters. (B) An example of SPI genes clustered on chromosome 3. Four genes on nscaf2925 are distributed in a cluster within 50 kb and eight genes on nscaf2931 are distributed in a cluster within 100 kb. The arrowhead indicates the transcriptional orientation of genes.