00277nam a2200109Ia 4500008004100000100001700041245002700058260002900085490001400114600002200128650001700150140224s9999 xx 000 0 und d aMeans, A.R.  aMethods in Enzymology. aNew YorkbAcademic Press av102 pt G aA.R. Means et al. aBiochemistry