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 ":".
They
can
be
degraded
either
by
methylation
by
catechol-
''
O
''
-methyltransferases
(
COMT
)
or
by
deamination
by
monoamine
oxidases
(
MAO
)
.
They:O
can:O
be:O
degraded:O
either:O
by:O
methylation:O
by:O
catechol-:other-biologything
'':other-biologything
O:other-biologything
'':other-biologything
-methyltransferases:other-biologything
(:O
COMT:other-biologything
):O
or:O
by:O
deamination:O
by:O
monoamine:other-biologything
oxidases:other-biologything
(:O
MAO:other-biologything
):O
.:O