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Genomic organization of the elephant shark protocadherin cluster. Constant exons at the end of each subcluster are shown in red color. Variable exons in the same paralog subgroup or intersubcluster subgroup are shown in the same color. Only a single pseudogene (ψ1) was identified. νCX2b is an alternatively spliced “constant” exon. The positions and identification numbers of BAC clones sequenced are shown below.
