What classes of histones are found as a pair in the nucleosome?
The two classes of histones found as a pair in the nucleosome are H2A and H2B.
H2A and H2B form a dimer, which is the basic unit of the nucleosome. This dimer is then wrapped around by DNA to form the nucleosome.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:

What classes of histones are found as a pair in the nucleosome?

### Response:

The two classes of histones found as a pair in the nucleosome are H2A and H2B.
H2A and H2B form a dimer, which is the basic unit of the nucleosome. This dimer is then wrapped around by DNA to form the nucleosome.
