- Expression of the murine plasma cell nucleotide pyrophosphohydrolase PC-1 is shared by human liver, bone, and cartilage cells. Regulation of PC-1 expression in osteosarcoma cells by transforming growth factor-beta. Huang, R., Rosenbach, M., Vaughn, R., Provvedini, D., Rebbe, N., Hickman, S., Goding, J., Terkeltaub, R. J. Clin. Invest. (1994)