SERPINA1 and mucopolysaccharidosis: Moreover, proteins that were dysregulated in this group included some previously proposed as biomarkers of MPS (e.g., A1AT[alpha 1 antitrypsin]) [33].We also observed dysregulation of proteins involved in inflammation (S10A9), binding to collagen (C1QC), and prothrombin (THRB), a thyroid hormone receptor that mediates the biological activities of thyroid hormone [34].