19.1 Introduction 19.2 The nucleosome is the subunit of all chromatin 19.3 DNA is coiled in arrays of nucleosomes 19.4 Nucleosomes have a common structure 19.5 DNA structure varies on the nucleosomal surface
15.1 Introduction 15.2 Insertion sequences are simple transposition modules 15.3 Composite transposons have IS modules 15.4 Transposition occurs by both replicative and nonreplicative mechanisms
