I looked into the file provided by shrimp and it is a hackish, python script doing the same like the one from emboss but accepting fever arguments and in different format. I propose keeping the one from emboss and the file from shrimp to rename as /usr/bin/extractseq.py. BTW, /var/tmp/portage/sci-biology/shrimp-2.2.3/image/usr/bin/ contains README file. ;-)
+ 17 Feb 2013; Justin Lecher <jlec@gentoo.org> shrimp-2.0.1.ebuild, + -shrimp-2.1.0.ebuild, shrimp-2.2.3.ebuild, metadata.xml: + Drop old; block collision with emboss, #450426; move to new python eclasses +