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 ":".
Parasitised
erythrocytes
adhere
to
endothelium
at
the
trophozoite/schizonts
stage
simultaneous
with
the
appearance
of
the
``
var
''
gene
product
(
erythrocyte
membrane
protein
1
)
on
the
erythrocyte
surface
.
Parasitised:O
erythrocytes:O
adhere:O
to:O
endothelium:O
at:O
the:O
trophozoite/schizonts:O
stage:O
simultaneous:O
with:O
the:O
appearance:O
of:O
the:O
``:O
var:O
'':O
gene:O
product:O
(:O
erythrocyte:O
membrane:O
protein:O
1:O
):O
on:O
the:O
erythrocyte:O
surface:O
.:O