ELISA kits for the study of the target, PEG are available in ready-to-use formats. The protein is also known as progestagen associated endometrial protein or PAEP. It is a 180-residue protein with a secreted localization. In addition, up to 3 isoforms have been discovered. Other alias names for this target include: glycodelin-S, glycodelin-F, alpha uterine protein, PP14 protein (placental protein 14), PEG, and glycodelin, and pregnancy-associated endometrial alpha-2 globulin. ELISA suppliers report species reactivity to the following: human, chicken, primate, and other mammalian.