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 ":".
The
ZPA
also
plays
an
important
role
in
initially
specifying
digit
identity
,
while
later
maintaining
proper
AER
morphology
and
continued
FGF8
secretion
–
to
ensure
proper
mitotic
activity
of
the
limb
bud
mesenchyme
beneath
.
The:O
ZPA:other-biologything
also:O
plays:O
an:O
important:O
role:O
in:O
initially:O
specifying:O
digit:O
identity:O
,:O
while:O
later:O
maintaining:O
proper:O
AER:other-biologything
morphology:O
and:O
continued:O
FGF8:other-biologything
secretion:O
–:O
to:O
ensure:O
proper:O
mitotic:O
activity:O
of:O
the:O
limb:O
bud:O
mesenchyme:O
beneath:O
.:O