With no explanation, label each line with "O", "other-chemicalthing", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
DNA
synthesis
is
initiated
by
the
RNA
polymerase
primase
,
which
makes
an
RNA
primer
with
a
free
3'OH
.
DNA:other-biologything
synthesis:O
is:O
initiated:O
by:O
the:O
RNA:other-biologything
polymerase:other-biologything
primase:other-biologything
,:O
which:O
makes:O
an:O
RNA:other-biologything
primer:other-biologything
with:O
a:O
free:O
3'OH:other-chemicalthing
.:O