PAPPA (Pregnancy-Associated Plasma Protein A): PAPPA is a protease that cleaves insulin-like growth factor binding proteins, thereby increasing the availability of insulin-like growth factors (IGFs). It plays a significant role in fetal development and has been used as a biomarker in prenatal screening for aneuploidies. Abnormal levels of PAPPA are associated with adverse pregnancy outcomes, including preeclampsia and intrauterine growth restriction....