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 ":".
Interleukin
2
(
IL-2
)
is
a
protein
that
helps
T
cells
of
the
immune
system
attack
pathogens
and
tumors
.
Interleukin:other-biologything
2:other-biologything
(:O
IL-2:other-biologything
):O
is:O
a:O
protein:O
that:O
helps:O
T:other-biologything
cells:other-biologything
of:O
the:O
immune:O
system:O
attack:O
pathogens:other-biologything
and:O
tumors:O
.:O