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 ":".
TET
enzymes
play
a
central
role
in
demethylation
of
methylated
cytosines
.
TET:other-biologything
enzymes:other-biologything
play:O
a:O
central:O
role:O
in:O
demethylation:O
of:O
methylated:other-chemicalthing
cytosines:other-chemicalthing
.:O