Pregnancy zone protein (PZP), also known as ZP3, is a glycoprotein found in the zona pellucida of mammalian eggs. This protein plays a critical role in fertilization and is often used in contraceptive drugs and vaccines. Some synonyms for PZP might include Zona pellucida glycoprotein 3, Zona pellucida 3, ZP oocyte receptor glycoprotein 3, and Zona pellucida sperm-binding protein 3. These terms are commonly used in scientific literature and research, and all refer to the same protein. Understanding these synonyms can be important for researchers and healthcare professionals who are working with PZP for various applications.