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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: J Mol Evol. 2008 Dec;67(6):653–669. doi: 10.1007/s00239-008-9177-2

FIGURE 4.

FIGURE 4

Duplication within the N-8Ig region of the projectin protein. A) The first N-Ig domains of C. elegans twitchin (Cel-Ig1-3), P. clarkii (Pcl-Ig1-7), A. pisum (Api1-8) and D. melanogaster (Dmel1-8) projectin were aligned and a phylogenetic tree derived (See M&M for details). The scale bar corresponds to 0.1 estimated amino acid substitutions per site. B) A proposed scenario for N-8Ig domain duplication from three Ig domains in C. elegans to eight in insects based on the current phylogenetic relationship between the individual Ig domains.