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 ":".
Upon
viral
infection
,
FADD
is
needed
to
increase
the
levels
of
Irf7
a
molecule
which
is
needed
for
the
production
of
IFN-α
.
Upon:O
viral:O
infection:O
,:O
FADD:other-biologything
is:O
needed:O
to:O
increase:O
the:O
levels:O
of:O
Irf7:other-biologything
a:O
molecule:O
which:O
is:O
needed:O
for:O
the:O
production:O
of:O
IFN-α:other-biologything
.:O