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 ":".
It
has
been
suggested
that
SMO
is
regulated
by
a
small
molecule
,
the
cellular
localization
of
which
is
controlled
by
PTCH
.
It:O
has:O
been:O
suggested:O
that:O
SMO:O
is:O
regulated:O
by:O
a:O
small:O
molecule:O
,:O
the:O
cellular:O
localization:O
of:O
which:O
is:O
controlled:O
by:O
PTCH:other-biologything
.:O