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 ":".
The
ε-amino
group
often
participates
in
hydrogen
bonding
and
as
a
general
base
in
catalysis
.
The:O
ε-amino:other-chemicalthing
group:other-chemicalthing
often:O
participates:O
in:O
hydrogen:other-chemicalthing
bonding:O
and:O
as:O
a:O
general:O
base:O
in:O
catalysis:O
.:O