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 ":".
Angiogenesis
is
important
in
embryonic
development
but
it
is
also
a
fundamental
process
of
tumor
growth
.
Angiogenesis:O
is:O
important:O
in:O
embryonic:O
development:O
but:O
it:O
is:O
also:O
a:O
fundamental:O
process:O
of:O
tumor:O
growth:O
.:O