box C/D sno(s)RNA processing box C/D sno(s)RNA 5'-end processing https://github.com/geneontology/go-ontology/issues/26930 2021-11-02T14:11:42Z hjd biological_process Any process involved in forming the mature 5' end of a box C/D RNA molecule. GO:0106410 snoRNA 2,2,7-trimethylguanosine (TMG) capping