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 ":".
Retinoic
acid
is
required
ventrally
along
with
Shh
to
induce
Pax6
and
Olig2
during
differentiation
of
motor
neurons
.
Retinoic:other-biologything
acid:other-biologything
is:O
required:O
ventrally:O
along:O
with:O
Shh:other-biologything
to:O
induce:O
Pax6:other-biologything
and:O
Olig2:other-biologything
during:O
differentiation:O
of:O
motor:O
neurons:O
.:O