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 ":".
PTCH
acts
like
a
sterol
pump
and
removes
oxysterols
that
have
been
created
by
7-dehydrocholesterol
reductase
.
PTCH:other-biologything
acts:O
like:O
a:O
sterol:O
pump:O
and:O
removes:O
oxysterols:O
that:O
have:O
been:O
created:O
by:O
7-dehydrocholesterol:O
reductase:O
.:O