Final answer:
Nucleosomes are the structures that can mobilize DNA regions between them.
Step-by-step explanation:
Two nucleosomes can mobilize any region of DNA that lies between them.
Nucleosomes are composed of histone proteins, which can move along the DNA string to expose different sections of the molecule.
When nucleosomes slide down the DNA, they open specific chromosomal regions, allowing for gene expression and transcription to occur.