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 ":".
CNTF
has
been
shown
to
promote
the
survival
of
neuronal
cultures
``
in
vitro
''
,
and
it
can
also
act
as
a
differentiator
and
trophic
factor
on
glial
cells
.
CNTF:other-biologything
has:O
been:O
shown:O
to:O
promote:O
the:O
survival:O
of:O
neuronal:O
cultures:O
``:O
in:O
vitro:O
'':O
,:O
and:O
it:O
can:O
also:O
act:O
as:O
a:O
differentiator:O
and:O
trophic:O
factor:O
on:O
glial:O
cells:O
.:O