title: Levels of control: a useful frame of perception.
mesh_terms: D000256:Adenoviridae / Q000378:metabolism; D000818:Animals; D001358:Avian Sarcoma Viruses / Q000378:metabolism; D002454:Cell Differentiation; D002459:Cell Fusion; D002471:Cell Transformation, Neoplastic; D004261:DNA Replication; D004626:Embryology; D005260:Female; D005809:Genes, Regulator; D005815:Genetic Code; D008967:Molecular Biology; D010063:Ovum / Q000378:metabolism; D012335:RNA, Ribosomal / Q000096:biosynthesis
chemical_list: D012335:RNA, Ribosomal