title: Group II and group III introns of twintrons: potential relationships with nuclear pre-mRNA introns.
abstract: Two new and important features of introns have emerged from analysis of the Euglena gracilis chloroplast genome. One is a new class of introns, designated group III, that may be the closest contemporaries to nuclear pre-mRNA introns. The second is introns that are interrupted by other introns termed twintrons.
authors.affiliation: Department of Biochemistry, University of Arizona, Tucson 85721.
authors.forename: D W
authors.initials: DW
authors.lastname: Copertino
authors.forename: R B
authors.initials: RB
authors.lastname: Hallick
mesh_terms: D000818:Animals; D001483:Base Sequence; D002736:Chloroplasts; D005056:Euglena gracilis / Q000235:genetics*; D007438:Introns; D008969:Molecular Sequence Data; D012333:RNA, Messenger; D015138:RNA, Nuclear
chemical_list: D012333:RNA, Messenger; D015138:RNA, Nuclear