Fig. 9. Evaluation of total creatine kinase (CK) enzyme activity in hindlimb and extraocular muscle (EOM). Total CK enzyme activity was evaluated in triplicate for homogenates of hindlimb and EOM between P7 and P45. P7 activity levels were not different among the two muscle groups and both showed postnatal increases in activity. Activity levels, however, subsequently diverged, with adult hindlimb muscle attaining values 3-fold higher than those of EOM. Values are means + S.D.; ^* denotes P<0.01.