SQL queries sent against the federated DB to extract information from GenBank. Query A retrieves from GenBank the data useful for the subsequent statistical analysis. The search criteria, included in this query, are shown. They allowed to extract the records related to "Ascomycota" mitochondrial genes containing one term as "CDS", "tRNA", or "rRNA" in the field feature key and one of the terms "gene", "product", "note" or "translation" in the qualifier name field. Query B is used to recover from GenBank the DNA sequences corresponding only to the coding part of each gene.