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
series
of
signaling
cascade
generally
regulates
programmed
cell-death
or
apoptosis
.
This:O
series:O
of:O
signaling:O
cascade:O
generally:O
regulates:O
programmed:O
cell-death:O
or:O
apoptosis:O
.:O