| Tumor protein D 52 ( TPD 52 ) : a novel B cell / plasma cell molecule with unique expression pattern and Ca ( 2+ ) dependent association with annexin 6 . ^^^ Tumor protein D 52 ( TPD 52 ) : a novel B cell / plasma cell molecule with unique expression pattern and Ca ( 2+ ) dependent association with annexin 6 . ^^^ In the Thiel myeloma cell line , TPD 52 bound to annexin 6 in a Ca ( 2+ ) dependent manner , suggesting that these molecules may act in concert to regulate secretory processes in plasma cells , similarly to what was observed in pancreatic acinar cells . ^^^ |