Abstract
A 5.3 S RNA species observed in urea-gel electrophoretic analysis of the RNA of the small ribosomal subunit of rat liver has been identified from its sequence as the 5′-terminal 133–134 base fragment of 18 S RNA. Presumably it is cleaved by an endogenous endonuclease when the ribosomal subunits are dissociated, because it usually is not observed in 18 S RNA obtained by direct extraction of cells or tissues.
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