What is another word for early pregnancy factor?
Pronunciation: [ˈɜːlɪ pɹˈɛɡnənsi fˈaktə] (IPA) 
Early pregnancy factor (EPF) is a protein that can be detected in the blood of a woman as early as 24 - 48 hours after fertilization. Synonyms for EPF include zygote recognition factor (ZRF), preimplantation factor (PIF), and trophoblastin. PIF is a term that describes a group of polypeptides secreted by the embryo that have a variety of functions including implantation, immune modulation and signaling. Furthermore, trophoblastin refers to the protein produced by trophoblast cells, which are the outermost layer of cells in the developing embryo. The discovery of EPF and its synonyms has made early pregnancy detection easier, aiding in the early diagnosis of pregnancy and complications.
