With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
He
has
recently
published
work
showing
that
estrogen
,
given
at
the
right
time
,
causes
the
destruction
of
cancer
cells
rather
than
feeding
their
growth
.
He:O
has:O
recently:O
published:O
work:O
showing:O
that:O
estrogen:O
,:O
given:O
at:O
the:O
right:O
time:O
,:O
causes:O
the:O
destruction:O
of:O
cancer:O
cells:O
rather:O
than:O
feeding:O
their:O
growth:O
.:O