The use of DNA information to direct the production of particular proteins is called gene expression.

Here's a breakdown:

* DNA: Contains the genetic code, a blueprint for building and maintaining an organism.

* Gene: A segment of DNA that codes for a specific protein.

* Protein: A complex molecule essential for many biological functions.

Gene expression is the process by which the information in a gene is used to create a functional product, typically a protein. It involves two main steps:

1. Transcription: DNA is copied into a messenger RNA (mRNA) molecule.

2. Translation: mRNA is used as a template to assemble amino acids into a protein.

So, gene expression is the whole process by which DNA's instructions are used to build a specific protein.