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 ":".
This
reaction
yields
a
methylated
protein
and
SAH
.
This:O
reaction:O
yields:O
a:O
methylated:other-biologything
protein:other-biologything
and:O
SAH:other-biologything
.:O