to refine the secondary structure model of the 5 ' end of the bacteriophage ms2 genome , 32p-labeled ms2 rna was partially digested with t1 rnase or with cm-rnase and the 5'-end fragment was isolated , renatured and submitted to treatment with methoxyamine or kethoxal .
C0018364
t1 rnase
C0014241
rnase