--- At 6:37 PM +0100 5/29/03, Christophe Bouvard wrote: >I am a new member of this list. Before asking my two questions, here is a >very short presentation of me: >... >I started in the bioinformatics' world >a month ago. My work is about the implementation of an functional data bank Christophe, you may find this book helpful: Bioinformatics: A Practical Guide A detailed tour of the online databases and existing tools for analysis of genes and proteins. <http://www.amazon.com/exec/obidos/ASIN/0471383910> It is a bit old, but it provides concise information about commonly used BioInformatics databases and their data formats. Rather than answering your question, it may help you understand what resources are available. There are many code projects which can demonstrate how to perform tasks similar to what you want, but you may need a better understanding to know what pieces are useful to your problem and what are not. I believe the book ends with a description of using Perl to work with the databases. Regards...eric