Recently I had to annotate a large (10,000+) number of genes identified by Entrez Gene IDs. My goal was to avoid “annotation files” (basically CSV files) that a part of wet lab group likes, because I wanted to stay up-to-date without having to remember to update them. So the obvious solution was to use a service available on the web, and in an automated way. For reference, I just tried to attach gene symbol, gene name, chromosome and cytoband.