Glycol Methacrylate embedding medium provides excellent preservation (especially enzymatic autoradiographic studies). Good for E.M., L.M., and Histo. Leduc. and Bernard, (1967) , J. Ultrastr. Res., 4, 196-99. Kit consists of: 450 ml GMA, 225 ml n-Butylmethacrylate, 15g 2,4-Dichlorobenzoyl Peroxide paste