What is the set of proteins found in a specific cell under certain conditions called?

The correct answer is proteome, which refers to the entire set of proteins that is produced or expressed by a specific cell, tissue, or organism under particular conditions at a given time. The proteome can change in response to various factors such as developmental stage, environmental changes, or differing physiological states, making it a dynamic entity that reflects the functional status of the cell.

In contrast, the genome represents the complete set of genes and genetic material present in an organism and does not change in response to conditions. The cytome refers to the structure or internal components of a cell but does not specifically address the proteins. Cell signature is a less commonly used term that may refer to specific markers or characteristics of a cell type, but it does not specifically denote the complete set of proteins in the way that "proteome" does.