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 ":".
Activation
of
MAP
kinase
in
turn
causes
release
of
prostaglandin
D2
from
Langerhans
cells
in
the
skin
.
Activation:O
of:O
MAP:other-biologything
kinase:other-biologything
in:O
turn:O
causes:O
release:O
of:O
prostaglandin:other-biologything
D2:other-biologything
from:O
Langerhans:other-biologything
cells:other-biologything
in:O
the:O
skin:O
.:O