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 ":".
Further
,
CNTF
has
been
previously
shown
to
affect
the
differentiation
of
glial
precursor
cells
``
in
vitro
''
;
however
,
the
influence
of
CNTF
in
the
``
in
vivo
''
setting
has
only
recently
been
determined
.
Further:O
,:O
CNTF:other-biologything
has:O
been:O
previously:O
shown:O
to:O
affect:O
the:O
differentiation:O
of:O
glial:O
precursor:O
cells:O
``:O
in:O
vitro:O
'':O
;:O
however:O
,:O
the:O
influence:O
of:O
CNTF:other-biologything
in:O
the:O
``:O
in:O
vivo:O
'':O
setting:O
has:O
only:O
recently:O
been:O
determined:O
.:O