snoZ7 RNA guides the methylation of 25S rRNA position A1372, whereas SnoR77Y guides the methylation of 18S rRNA at position U580. This family of snoRNAs has been found in plant species such as Arabidopsis thaliana.
A particular type of small nuclear RNA (snoRNA), snoZ7, plays a role in modifying the structure of 25S rRNA by adding a methyl group to a specific position (A1372). Meanwhile, SnoR77Y is involved in a similar process for 18S rRNA at position U580. This type of snoRNA has been studied in plant species such as Arabidopsis thaliana.