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 ":".
By
modulating
retinoblastoma
protein
activity
in
rat
cochlea
,
sonic
hedgehog
allows
mature
hair
cells
that
normally
can
not
return
to
a
proliferative
state
to
divide
and
differentiate
.
By:O
modulating:O
retinoblastoma:O
protein:O
activity:O
in:O
rat:other-biologything
cochlea:other-biologything
,:O
sonic:other-biologything
hedgehog:other-biologything
allows:O
mature:O
hair:O
cells:O
that:O
normally:O
can:O
not:O
return:O
to:O
a:O
proliferative:O
state:O
to:O
divide:O
and:O
differentiate:O
.:O