irradiation of aqueous solutions of escherichia coli 50s ribosomes with 253.7-nm radiation results in the formation of single-strand breaks in double-stranded regions of the 23s rrna component , but not in rrna chain scission , and destabilization of the secondary structure of the 23s rrna toward denaturation .
C0035701
rrna
C0035704
23s rrna