Supplied at 200,000 U/mL in 50 mM Tris-HCl, 150 mM NaCl, 0.1 mM EDTA, 1 mM dithiothreitol, 0.1% NP-40 Alternative, 50% glycerol, pH 7.6 @ 25 C. Also provided is 10X M-MuLV RT Buffer which in 1X form is composed of 50 mM Tris-HCl, 75 mM KCl, 3 mM MgCl2, 10 mM dithiothreitol, pH 8.3 @ 25 C. 250,000 U is supplied as 5 50,000 U.