55First of all, in the absence of harmonisation of a profession, Member States remain, in principle, competent to define the exercise of that profession but must, when exercising their powers in this area, respect the basic freedoms guaranteed by the Treaty (see, in particular, Case C-58/98 Corsten [2000] ECR I-7919, paragraph 31; Case C-108/96 Mac Quen and Others [2001] ECR I-837, paragraph 24; and Case C-294/00 Gräbner [2002] ECR I-6515, paragraph 26).
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