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Partial sequence alignment from a conserved region of a Na(+)/H(+) exchange regulatory factor protein (NRFL-1) harboring a 1 aa insertion (boxed) which is specific for the phylum Nematoda. Most nematodes species contain two homologs of this protein and this CSI is specifically present in one of these two homologs. More detailed information regarding the species distribution of this CSI is provided in Figure S51.
