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 ":".
L-selectin
is
also
present
on
the
surface
of
human
embryo
trophoblasts
prior
to
implantation
into
the
uterus
.
L-selectin:other-biologything
is:O
also:O
present:O
on:O
the:O
surface:O
of:O
human:O
embryo:O
trophoblasts:O
prior:O
to:O
implantation:O
into:O
the:O
uterus:O
.:O