Enhancers and ribosomal gene spacers.
D000818:Animals; D001483:Base Sequence; D005786:Gene Expression Regulation; D005799:Genes, Dominant; D005809:Genes, Regulator; D006824:Hybridization, Genetic; D012318:RNA Polymerase I / Q000378:metabolism*; D012335:RNA, Ribosomal / Q000235:genetics*; D014981:Xenopus / Q000235:genetics
D012335:RNA, Ribosomal; D012318:RNA Polymerase I