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 ":".
This
prevents
RNA
polymerase
from
binding
to
and
transcribing
the
operon
,
so
tryptophan
is
not
produced
from
its
precursor
.
This:O
prevents:O
RNA:other-biologything
polymerase:other-biologything
from:O
binding:O
to:O
and:O
transcribing:O
the:O
operon:O
,:O
so:O
tryptophan:other-biologything
is:O
not:O
produced:O
from:O
its:O
precursor:O
.:O