With no explanation, label each line with "O", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
gene
localizes
to
the
'Down
critical
region
'
of
chromosome
21
.
This:O
gene:O
localizes:O
to:O
the:O
'Down:O
critical:O
region:O
':O
of:O
chromosome:other-biologything
21:other-biologything
.:O