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 ":".
Inactivation
of
one
of
the
X
chromosomes
is
initiated
by
a
long
non
coding
RNA
called
Xist
.
Inactivation:O
of:O
one:O
of:O
the:O
X:other-biologything
chromosomes:other-biologything
is:O
initiated:O
by:O
a:O
long:O
non:O
coding:O
RNA:other-biologything
called:O
Xist:other-biologything
.:O