With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
These
HATs
are
known
to
acetylate
all
of
the
histone
subunits
in
the
nucleosome
.
These:O
HATs:O
are:O
known:O
to:O
acetylate:O
all:O
of:O
the:O
histone:O
subunits:O
in:O
the:O
nucleosome:O
.:O