>98% [TLC]
Histochemical substrate for LacZ reporter gene: J. Weis et al., J. Cell Biol., 112, 1385 (1991); A. Aguzzi and F. Theuring, Histochemistry, 102, 477 (1994); P. Poggi et al., Acta Anat., 159, 218 (1997).