CD Monocyte Differentiation Antigen, also known as CD14, is a crucial protein found on the surface of monocytes and macrophages. It plays a vital role in mediating immune responses and recognizing bacterial cell wall components. Although CD14 is the most commonly used name for this antigen, there are several synonyms for it. These include MY4 antigen, MO1, Leu-M9, and LPS receptor. Having various names for CD Monocyte Differentiation Antigen can sometimes lead to confusion, but medical professionals and researchers understand that these synonyms refer to the same protein. Understanding these alternative terms can facilitate effective communication and collaboration in the field of immunology.