part of rDNA heterochromatin formation https://github.com/geneontology/go-ontology/issues/19238 https://github.com/geneontology/go-ontology/issues/23553 chromatin silencing at rDNA heterochromatic silencing at rDNA Reactome:R-HSA-427359 Reactome:R-HSA-427413 The formation of heterochromatin at ribosomal DNA, characterized by the modified histone H3K9me3. GO:0000183 biological_process rDNA chromatin silencing chromatin silencing at ribosomal DNA rDNA heterochromatin assembly facultative heterochromatin formation nucleolar chromatin organization