“…Although plant pre-rRNA processing appears to follow a pathway similar to that of other eukaryotes (Grierson, 1982), only a few major processing sites have been identified (e.g., Toloczyki and Feix, 1986;Vincentz and Flavell, 1989), and detailed analysis of all processing sites has yet to be performed. Moreover, no specific sites of ribose methylation or pseudouridylation have been mapped in plant nuclear rRNA.…”