Splice points of the third intron in the yeast mitochondrial cytochrome b gene.

We report the nucleotide sequences at the splicing junctions of intron 13 of the cytochrome b (box) "long" gene of the mitochondrion of Saccharomyces cerevisiae and compare them with the homologous sequences in Aspergillus nidulans. The two introns occupy exactly the same position and display an open reading frame in phase with the preceding exon at the 5' end and a blocked region at the 3' end.