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 ":".
However
,
most
of
the
mutations
occur
in
the
thymidine
kinase
gene
rather
than
the
DNA
polymerase
gene
.
However:O
,:O
most:O
of:O
the:O
mutations:O
occur:O
in:O
the:O
thymidine:O
kinase:O
gene:O
rather:O
than:O
the:O
DNA:other-biologything
polymerase:O
gene:O
.:O