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. 2003 Jan 29;4(2):R14. doi: 10.1186/gb-2003-4-2-r14

Figure 3.

Figure 3

Fitch diagram [29] illustrating the origin and distribution of ortholog and paralogs of trpD in cyanobacteria. Paralogs, originating by gene duplication events (Dp1 and Dp2), track back to a horizontal line, whereas orthologs, originating by speciation (Sp1, Sp2, Sp3 and Sp4), track back to an inverted Y. The six trpD genes of Nostoc (Npu) and Anabaena (Asp) comprise a paralog set, and each of those comprises a four-member ortholog set with respect to the trpD genes from P. marinus (Pmu), Synechococcus sp. (Syn), and Synechocystis sp. (Ssp).