- The urokinase plasminogen activator receptor-associated protein/endo180 is coexpressed with its interaction partners urokinase plasminogen activator receptor and matrix metalloprotease-13 during osteogenesis. Engelholm, L.H., Nielsen, B.S., Netzel-Arnett, S., Solberg, H., Chen, X.D., Lopez Garcia, J.M., Lopez-Otin, C., Young, M.F., Birkedal-Hansen, H., Danø, K., Lund, L.R., Behrendt, N., Bugge, T.H. Lab. Invest. (2001)