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rRNA analysis from wt and mutant yeast strains. Seven micrograms of total yeast RNA was separated on a denaturing agarose gel and subjected to hybridization with 18S and 20S pre-rRNA specific probe (18S-A) (33). Ethidium bromide stained gel (top). Northern blot (bottom). The positions of 25S and 18S rRNA species are indicated.
