- The increased ecto-5'-nucleotidase activity in muscle, heart and liver of laminin alpha2-deficient mice is not caused by an elevation in the mRNA content. Morote-García, J.C., Sánchez Del Campo, L.F., Campoy, F.J., Vidal, C.J., Muñoz-Delgado, E. Int. J. Biochem. Cell Biol. (2006)