Variability in the rbcL Introns of Caulerpalean Algae (Chlorophyta, Ulvophyceae)
gene have been reported to date. Four new cases from Caulerpales, Ulvophyceae are described here. In the genus Caulerpa, the presence of an intron was unstable even in the infraspecific taxa. Based on comprehensive comparisons of the inserted positions, lengths of introns and so on, the presence of at least three kinds of introns, which probably have independent origins, was suggested in Caulerpales.
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