As the EU legislation in the tissue and cell does not provide a basis for full harmonisation and as Directives allow the Member States a certain degree of discretion as to how to ensure their implementation, there are accordingly many differences between Member States in the approaches they have taken to implementation.
Kuna kudede ja rakkude käitlemist käsitlevate ELi õigusaktidega ei nähta ette täielikku ühtlustamist ja direktiivid jätavad liikmesriikidele teatava otsustusõiguse selle üle, kuidas tagada nende rakendamine, on liikmesriikide rakendamisviiside vahel sellest tulenevalt palju erinevusi.