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 ":".
These
studies
helped
demonstrate
how
ultrasensitivity
,
positive
feedback
,
and
bistability
can
allow
cells
to
switch
between
discrete
states
.
These:O
studies:O
helped:O
demonstrate:O
how:O
ultrasensitivity:O
,:O
positive:O
feedback:O
,:O
and:O
bistability:O
can:O
allow:O
cells:O
to:O
switch:O
between:O
discrete:O
states:O
.:O