We handle FASTA file format on regular basis in our daily research lifr. It's cumbersome task to edit fasta sequences especially when data size is big. But don't worry FaBox is there to help you. FaBox is a collection of simple web services that enable researchers to quickly perform typical task with large sequence data. The services makes it easy to extract, edit, and replace sequence headers and join or divide data sets based on header information. You can read about bioinformatics tool FaBox in detail from HERE or you can download FaBox software also.