Hi Brad, I managed to do a git script to select out the GFF code and tests from your bcbb repository and get it into the Biopython source tree. The folder changes made it interesting ;) Input: https://github.com/chapmanb/bcbb (master branch) Output: https://github.com/peterjc/biopython/tree/brad_gff The tests pass, but that is as far as I have got with this. Brad, could you have a look at this new branch for sanity checking please? Peter