With no explanation, label each line with "O", "other-medical", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Tamoxifen
acts
as
a
selective
estrogen
receptor
modulator
(
SERM
)
,
or
as
a
partial
agonist
of
the
estrogen
receptors
(
ER
s
)
.
Tamoxifen:other-medical
acts:O
as:O
a:O
selective:O
estrogen:other-medical
receptor:other-medical
modulator:other-medical
(:O
SERM:other-medical
):O
,:O
or:O
as:O
a:O
partial:O
agonist:O
of:O
the:O
estrogen:other-biologything
receptors:other-biologything
(:O
ER:other-biologything
s:O
):O
.:O