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 ":".
MEK
activates
MAPK
(
also
known
as
ERK
)
,
which
can
go
on
to
regulate
transcription
and
translation
.
MEK:other-biologything
activates:O
MAPK:other-biologything
(:O
also:O
known:O
as:O
ERK:other-biologything
):O
,:O
which:O
can:O
go:O
on:O
to:O
regulate:O
transcription:O
and:O
translation:O
.:O