gsub doesn't work on bio::fastaformat, but does on bio::sequence
gsub doesn't work on bio::fastaformat, but does on bio::sequence

cboursnell/transrate,roryk/transrate,roryk/transrate,cboursnell/transrate,roryk/transrate,Blahah/transrate,cboursnell/transrate,Blahah/transrate,Blahah/transrate