(en) In female Wistar rats, total creatine (CT, sum of creatine and phosphocreatine), creatinekinase (CPK) and glycolytic aldolase evolve differently during growth from birth to 90 days of age according to very different time courses.
Jaafar, A., & Maréchal, G. (1984). [Creatine, Creatine-kinase and Aldolase of the Triceps-surae During Growth in the Rat]. Journal de Physiologie, 79(1), A27-A27. (Original work published 1984)