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 ":".
When
leucine
levels
are
low
,
ribosomal
stalling
during
the
translation
of
these
codons
leads
to
a
changed
secondary
structure
that
modifies
gene
expression
.
When:O
leucine:other-chemicalthing
levels:O
are:O
low:O
,:O
ribosomal:other-chemicalthing
stalling:O
during:O
the:O
translation:O
of:O
these:O
codons:O
leads:O
to:O
a:O
changed:O
secondary:O
structure:O
that:O
modifies:O
gene:O
expression:O
.:O