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
fact
,
studies
involving
mutation
of
genes
coding
for
protein
A
resulted
in
a
lowered
virulence
of
``
S.
aureus
``
as
measured
by
survival
in
blood
,
which
has
led
to
speculation
that
protein
A
-contributed
virulence
requires
binding
of
antibody
Fc
regions
.
In:O
fact:O
,:O
studies:O
involving:O
mutation:O
of:O
genes:O
coding:O
for:O
protein:other-biologything
A:other-biologything
resulted:O
in:O
a:O
lowered:O
virulence:O
of:O
``:O
S.:other-biologything
aureus:other-biologything
``:O
as:O
measured:O
by:O
survival:O
in:O
blood:O
,:O
which:O
has:O
led:O
to:O
speculation:O
that:O
protein:other-biologything
A:other-biologything
-contributed:O
virulence:O
requires:O
binding:O
of:O
antibody:O
Fc:other-biologything
regions:other-biologything
.:O