label: 32S pre-rRNA is nucleolytically processed at site 4 (4a) to yield 12S pre-rRNA and 28S rRNA (Saccharomyces cerevisiae)
label_lc: 32s pre-rrna is nucleolytically processed at site 4 (4a) to yield 12s pre-rrna and 28s rrna (saccharomyces cerevisiae)