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O
O
N
+
P
R
O
O
O
O
R
O
OH
O
H
O
O
O
O
OH
O
R'
O
P
H
H
R'
O
HO
Cholesterol
Phosphatidylcholine
Phosphatidylglycerol
R
O
O
O
O
HO
H
N
+
+
P
P
N
O
NH
2
(CH
2
)
1
O
O
O
O
(CH
2
)
13
O
O
O
O
O
OH
R
H
O
N
H
R
O
P
(CH
2
)
14
O
O
O
Phosphatidylserine
Sphingomyelin
1,2-Dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)
O
O
O
+
P
N
CH
2
(CH
2
)
16
CH
3
O
O
O
O
P
(CH
2
)CH
3
(CH
2
)
1
O
O
O
OH
O
O
OH
O
O
O
O
O
OH
O
OH
O
(CH
2
)
14
O
P
CH
2
(CH
2
)
16
CH
3
(CH
2
)
16
CH
3
O
1,2-Dipalmitoyl-sn-glycero-3-phospho-rac-
(1-glycerol) (DPPG)
L-alpha-phosphatidyl-DL-glycerol diasteroyl (DSPG)
L-alpha-phosphatidylcholine distearoyl (DSPC)
Fig. 11
Structure of lipids commonly used to formulate colloidal nanoparticles
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