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 ":".
Tumors
metastasize
to
particular
organs
due
to
the
migration
of
hematopoietic
bone
marrow
cells
expressing
VEGFR1
(
vascular
endothelial
growth
factor
receptor
1
)
and
stromal
cells
to
these
particular
sites
prior
to
the
formation
of
clinically
relevant
metastasis
.
Tumors:O
metastasize:O
to:O
particular:O
organs:O
due:O
to:O
the:O
migration:O
of:O
hematopoietic:other-biologything
bone:other-biologything
marrow:other-biologything
cells:other-biologything
expressing:O
VEGFR1:other-biologything
(:O
vascular:other-biologything
endothelial:other-biologything
growth:other-biologything
factor:other-biologything
receptor:other-biologything
1:other-biologything
):O
and:O
stromal:other-biologything
cells:other-biologything
to:O
these:O
particular:O
sites:O
prior:O
to:O
the:O
formation:O
of:O
clinically:O
relevant:O
metastasis:O
.:O