With no explanation, label each line with "O", "other-chemicalthing", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Acetylcholine
receptor
subunit
epsilon
is
a
protein
that
in
humans
is
encoded
by
the
``
CHRNE
``
gene
.
Acetylcholine:other-chemicalthing
receptor:O
subunit:O
epsilon:other-biologything
is:O
a:O
protein:O
that:O
in:O
humans:O
is:O
encoded:O
by:O
the:O
``:O
CHRNE:other-biologything
``:O
gene:O
.:O