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 ":".
It
has
also
been
found
to
block
voltage-gated
potassium
(
K+
)
channels
.
It:O
has:O
also:O
been:O
found:O
to:O
block:O
voltage-gated:O
potassium:other-chemicalthing
(:O
K+:other-chemicalthing
):O
channels:O
.:O