3.5.4.5 3 10.5 deoxycytidine as substrate, specific activity constant in this range, beyond these values irreversible inactivation occurs 3.5.4.5 3.5 10.5 deoxycytidine as substrate, beyond these values irreversible inactivation occurs 3.5.4.5 3.8 7.5 - 3.5.4.5 6 11 - 3.5.4.5 6.5 10.7 -