43Second, as regards the principle of effectiveness, it is clear from the case-law of the Court that the question as to whether a national procedural provision makes the exercise of rights conferred on individuals by EU law practically impossible or excessively difficult must be analysed by reference to the role of that provision in the procedure, viewed as a whole, and to the conduct and special features of that procedure before the various national bodies. In that context, it is necessary to take into consideration, where relevant, the principles which lie at the basis of the national legal system, such as the protection of the rights of the defence, the principle of legal certainty and the proper conduct of the proceedings (judgments of 21 February 2008, Tele2 Telecommunication, C‑426/05, EU:C:2008:103, paragraph 55 and the case-law cited, and of 29 October 2009, Pontin, C‑63/08, EU:C:2009:666, paragraph 47).
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