In article <95059.080316RJC8 at psuvm.psu.edu> Richard Cyr <RJC8 at psuvm.psu.edu> writes: > Does anyone know of a reference wher > e the extinction coefficient of CaM was determined? The Merck index gives the extinction coefficient(1%) at A280 to be 2.1 Christine Dept. of Biochemistry hughe014 at mc.duke.edu