40S ribosomal protein S21
endonucleolytic cleavage in ITS1 to separate SSU-rRNA from 5.8S rRNA and LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA)
PANTHER:PTN000047682 SGD:S000001765 SGD:S000003672