RT Journal Article SR Electronic T1 Levels of organization of the DNA in eucaryotic chromosomes. JF Pharmacological Reviews JO Pharmacol Rev FD American Society for Pharmacology and Experimental Therapeutics SP 469 OP 476 VO 30 IS 4 A1 U K Laemmli YR 1978 UL http://pharmrev.aspetjournals.org/content/30/4/469.abstract AB