translate English to French: However, the levels in spf mice treated with sodium benzoate were not significantly different from those in untreated spf controls in which a significant increase in plasma creatine kinase was already caused by chronic hyperammonemia.
L'effet additif du benzoate de sodium chez les souris spf n'a pu être observé car l'augmentation de la créatine kinase était déjà causée par l'hyperammoniémie chronique.