Ad.GFP is a popular gene expression system that has revolutionized the field of molecular biology. However, there are several synonymous terms used to describe this system, including adenovirus-GFP, adenoviral vector expressing green fluorescent protein, and adenovirus-mediated GFP gene expression. These synonyms all refer to the same genetic construct, in which a green fluorescent protein (GFP) gene is delivered into cells using an adenoviral vector. The resulting expression of GFP can be used as a powerful tool for studying gene regulation, protein localization, and cell signaling pathways. No matter which term is used, Ad.GFP technology has opened up numerous opportunities for scientists to unravel the mysteries of cellular biology.