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4.1.3. CHARGED R-‐GROUPS
Aspartic acid
ASP
D
Glutamic acid
GLU
E
H
NH
3 +
-
OOC
CH
2
C
O O
-
H
NH
3 +
-
OOC
CH
2
CH
2
C
O O
-
Lysine
LYS
K
H
NH
3 +
-
OOC
CH
2
CH
2
CH
2
CH
2
NH
3 +
Arginine
ARG
R
H
NH
3 +
-
OOC
CH
2
CH
2
CH
2
NH
C
HN NH
3 +
Histidine
HIS
H
H
NH
3 +
-
OOC
CH
2
C
N
NH
2