title: Structural repeating units in chromatin. I. Evidence for their general occurrence.
mesh_terms: D000663:Amphibians; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002467:Cell Nucleus / Q000648:ultrastructure; D002645:Chickens; D002696:Chlamydomonas / Q000648:ultrastructure*; D002843:Chromatin / Q000032:analysis / Q000187:drug effects / Q000648:ultrastructure*; D002875:Chromosomes / Q000648:ultrastructure; D003584:Cytological Techniques; D003851:Deoxyribonucleases / Q000494:pharmacology; D003852:Deoxyribonucleoproteins / Q000032:analysis; D004331:Drosophila melanogaster / Q000648:ultrastructure*; D004912:Erythrocytes / Q000648:ultrastructure*; D008274:Magnesium / Q000494:pharmacology; D009994:Osmolar Concentration; D010944:Plants / Q000648:ultrastructure*; D012343:RNA, Transfer / Q000494:pharmacology; D013045:Species Specificity; D013048:Specimen Handling
chemical_list: D002843:Chromatin; D003852:Deoxyribonucleoproteins; D012343:RNA, Transfer; D003851:Deoxyribonucleases; D008274:Magnesium; D002118:Calcium