Centre for Lusophone and European Literatures and Cultures Portugal, being home for more than 500 researchers, and the research unit with more young researchers in projects and positions of responsibility. Due to its established protocols, CLEPUL is part of an institutional network of cooperation for research in several areas of literary science and history of culture, including Portuguese institutions in Lisbon, Porto, Algarve and the Atlantic Islands, namely Madeira, and international institutions, such as in Australia and Canada, while keeping privileged relations with Lusophone countries, namely Brazil, Angola, Mozambique, Cape Verde, São Tomé and Príncipe and Guinea-Bissau. CLEPUL currently publishes six periodicals, to disseminate its scientific research results:
Proto-language system of isoglosses which held together dialects which were spoken by various tribes, from which the historically attested Indo-European languages emerged. Proto-language A proto-language, in the tree model of historical linguistics, is a language, usually hypothetical or reconstructed, and usually unattested, from which a number of attested known languages are believed to have descended by evolution, forming a language family. In the strict sense, a proto-language is the most recent common ancestor of a language family, immediately before the family started to diverge into the attested "daughter languages". It is therefore equivalent with the "ancestral language" or "parental language" of