potato spindle tuber viroid ( pstv ) , a small infectios rna , has been completely digested with rnase t1 and rnase a , and the resulting oligonucleotides have been sequenced using 5'-terminal 32p-labelling with gamma-32p atp and t4 polynucleotide kinase , fingerprinting and controlled nuclease p1 digestion .
C0018364
rnase t1
C0014241
rnase