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 ":".
This
enzyme
is
crucial
for
maintaining
the
one
carbon
metabolism
,
specifically
the
folate
cycle
.
This:O
enzyme:O
is:O
crucial:O
for:O
maintaining:O
the:O
one:O
carbon:O
metabolism:O
,:O
specifically:O
the:O
folate:O
cycle:O
.:O