title: A study of early events in ribosomal gene amplification.
mesh_terms: D000483:Alleles; D000818:Animals; D004261:DNA Replication; D004270:DNA, Circular / Q000235:genetics; D004912:Erythrocytes / Q000378:metabolism; D005260:Female; D005796:Genes; D008854:Microscopy, Electron; D009693:Nucleic Acid Hybridization; D009865:Oocytes / Q000378:metabolism; D009866:Oogenesis; D012335:RNA, Ribosomal / Q000235:genetics*; D014981:Xenopus / Q000235:genetics*
chemical_list: D004270:DNA, Circular; D012335:RNA, Ribosomal