![]() The 5′ and 3′ splice sites are in the same locations within each repeat so that the repeat is found only once in the mature mRNA. Two to nine base pairs around the 3′ splice site are repeated by an identical two to nine base pairs around the 5′ splice site. This study characterizes a splice site consensus sequence for dinoflagellate introns. One of the tandem repeat gene members contains an intron 26,372 bp long. The sequence contains an intron‐rich set of five highly expressed gene repeats arranged in tandem. This degree of confidence is not possible with PCR‐based contigs. These data, combined with information from a large transcriptomic library, allowed a high level of confidence of every base pair call. We report here the sequence and gene structure of a clone isolated from a cosmid library which, to our knowledge, represents the largest contiguously sequenced, dinoflagellate genomic, tandem gene array. Dinoflagellates are one of the last major lineages of eukaryotes for which little is known about genome structure and organization.
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