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 ":".
5-hydroxytryptamine
receptor
1B
also
known
as
the
5-HT1B
receptor
is
a
protein
that
in
humans
is
encoded
by
the
``
HTR1B
``
gene
.
5-hydroxytryptamine:other-biologything
receptor:other-biologything
1B:other-biologything
also:O
known:O
as:O
the:O
5-HT1B:other-biologything
receptor:O
is:O
a:O
protein:O
that:O
in:O
humans:O
is:O
encoded:O
by:O
the:O
``:O
HTR1B:other-biologything
``:O
gene:O
.:O