The part of a strand of DNA with regulatory sequences is called the regulatory region. This region is located upstream of the gene it controls, meaning it comes before the coding sequence that specifies the protein to be made.

Here's a breakdown of what makes up the regulatory region:

* Promoter: This is the primary control point for gene expression. It's where RNA polymerase binds to initiate transcription.

* Enhancer: These sequences can be located far away from the gene they regulate and can either activate or repress gene expression.

* Silencer: Similar to enhancers, silencers can be located far away and they specifically suppress gene expression.

* Transcription factor binding sites: These are short sequences of DNA that specific proteins called transcription factors bind to. Transcription factors can activate or repress gene expression depending on their type.

* Other regulatory elements: The regulatory region can also contain other elements, such as insulator sequences that prevent the spread of regulatory signals.

In short: The regulatory region of a gene controls how much and when a particular protein is produced.