/usr/share/EMBOSS/test/data/prot.ig is in emboss-test 6.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | ;IntelliGenetics format protein sequence, 100 bases
IG
ACDEFGHIKLMNPQRSTVWYACDEFGHIKLMNPQRSTVWYACDEFGHIKL
MNPQRSTVWYACDEFGHIKLMNPQRSTVWYACDEFGHIKLMNPQRSTVWY1
|