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 ":".
PRC2
acts
to
create
heterochromatin
in
these
regions
through
similar
mechanisms
to
the
mechanism
used
to
repress
genes
.
PRC2:other-biologything
acts:O
to:O
create:O
heterochromatin:other-biologything
in:O
these:O
regions:O
through:O
similar:O
mechanisms:O
to:O
the:O
mechanism:O
used:O
to:O
repress:O
genes:O
.:O