cleavage between SSU-rRNA and 5.8S rRNA of tetracistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, 2S rRNA, LSU-rRNA)
cleavage between ssu-rrna and 5.8s rrna of tetracistronic rrna transcript (ssu-rrna, 5.8s rrna, 2s rrna, lsu-rrna)