With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
When
the
cell
died
the
nucleus
went
through
destruction
stages
,
one
of
them
pyknosis
which
lead
to
the
release
of
a
basic
histone
group
and
this
happened
when
the
irreversible
condensation
of
chromatins
occurred
.
When:O
the:O
cell:O
died:O
the:O
nucleus:O
went:O
through:O
destruction:O
stages:O
,:O
one:O
of:O
them:O
pyknosis:O
which:O
lead:O
to:O
the:O
release:O
of:O
a:O
basic:O
histone:O
group:O
and:O
this:O
happened:O
when:O
the:O
irreversible:O
condensation:O
of:O
chromatins:other-chemicalthing
occurred:O
.:O