With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
neurotransmitters
GABA
and
5-HT
have
been
implicated
in
the
migration
as
well
.
The:O
neurotransmitters:other-chemicalthing
GABA:other-chemicalthing
and:O
5-HT:other-chemicalthing
have:O
been:O
implicated:O
in:O
the:O
migration:O
as:O
well:O
.:O