28It should be explained in this regard, first, that where a regulatory act entails implementing measures, judicial review of compliance with the European Union legal order is ensured irrespective of whether those measures are adopted by the European Union or the Member States. Natural or legal persons who are unable, because of the conditions governing admissibility laid down in the fourth paragraph of Article 263 TFEU, to challenge a regulatory act of the European Union directly before the European Union judicature are protected against the application to them of such an act by the ability to challenge the implementing measures which the act entails.
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