Three Forms of the 5.8-S Ribosomal RNA Species in Saccharomyces cerevisiae

The existence of three stable forms of the 5.8-S ribosomal RNA species in Saccharomyces cerevisiae has been demonstrated. The major form constitutes approximately 90% of the total 5.8-S RNA and the two minor forms each constitute approximately 5%. The nucleotide sequence of the major form begins pA-A-A-Cp. The sequences of the minor forms begin pU-A-U-U-A-A-A-A-A Cp and pA-U-A-U-U-A-A-A-A-A-Cp. The remainders of the sequence of all three forms appear to be identical.