“The addition of the enzyme inhibitors ethylenediaminetetraacetic acid and p-hydroxymercuibenzoate reduced the metabolism of CTX in the presence of 10% hemolysis after 1 hr at 37 degrees C from 41% to 19% with ethylenediaminetetraacetic acid (0.45 mM) and to 0% with p-hydroxymercuibenzoate (10 mM).”