endonucleolytic cleavage in 5'-ETS of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA)
endonucleolytic cleavage in 5'-ets of tricistronic rrna transcript (ssu-rrna, 5.8s rrna, lsu-rrna)
endonucleolytic cleavage at A-prime
endonucleolytic cleavage at a-prime