21 Article 26 Implementation and Monitoring 1. States Parties shall ensure the implementation of this Protocol at national level, and in their periodic reports submitted in accordance with Article 62 of the African Charter, indicate the legislative and other measures undertaken for the full realisation of the rights herein recognised. 2. States Parties undertake to adopt all necessary measures and in particular shall provide budgetary and other resources for the full and effective implementation of the rights herein recognised. Article 27 Interpretation The African Court on Human and Peoples' Rights shall be seized with matte rs of interpretation arising from the application or implementation of this Protocol. Article 28 Signature, Ratification and Accession 1. This Protocol shall be open for signature, ratification and accession by the States Parties, in accordance with their respective constitutional procedures. 2. The instruments of ratification or accession shall be deposited with the Chairperson of the Commission of the AU. Article 29 Entry into Force 1. This Protocol shall enter into force thirty (30) days after the deposit of the fifteenth (15) instrument of ratification.