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 ":".
In
addition
to
functioning
as
an
endogenous
prohormone
,
androstenedione
also
has
weak
androgenic
activity
in
its
own
right
.
In:O
addition:O
to:O
functioning:O
as:O
an:O
endogenous:other-chemicalthing
prohormone:other-chemicalthing
,:O
androstenedione:other-chemicalthing
also:O
has:O
weak:O
androgenic:O
activity:O
in:O
its:O
own:O
right:O
.:O