With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
bacteria
,
genes
related
to
leucine
are
known
to
be
regulated
either
by
a
short
open
reading
frame
known
as
the
Leucine
operon
leader
,
or
by
T-boxes
.
In:O
bacteria:O
,:O
genes:O
related:O
to:O
leucine:other-chemicalthing
are:O
known:O
to:O
be:O
regulated:O
either:O
by:O
a:O
short:O
open:O
reading:O
frame:O
known:O
as:O
the:O
Leucine:other-chemicalthing
operon:O
leader:O
,:O
or:O
by:O
T-boxes:O
.:O