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4..1.2. POLAR
(HYDROPHILIC) R-‐GROUPS
H
NH
3 +
-
OOC
H
H
NH
3 +
-
OOC
CH
2
H
NH
3 +
-
OOC
HC
H
NH
3 +
-
OOC
CH
2
OH
CH
3
SH
Glycine
GLY
G
Serine
SER
S
Threonine
THR
T
Cysteine
CYS
C
Tyrosine
TYR
Y
Asparagine
ASN
N
Glutamine
GLN
Q
OH
H
NH
3 +
-
OOC
CH
2
OH
H
NH
3 +
-
OOC
CH
2
C
O NH
2
H
NH
3 +
-
OOC
CH
2
CH
2
C
O NH
2