Agroup of cells that have the same function is

A group of cells that have the same function is called a tissue.

Explanation:

A tissue consists of a group of cells that usually have a common origin, work together and are arranged neatly to carry out a specific function. The cells make up a certain structure and each of the cells that make up the structure (the tissue) are essential for it to do its own function.

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.