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 ":".
In
a
negative
feedback
loop
,
MDM2
itself
is
induced
by
the
p53
protein
.
In:O
a:O
negative:O
feedback:O
loop:O
,:O
MDM2:other-biologything
itself:O
is:O
induced:O
by:O
the:O
p53:O
protein:O
.:O