; For more background on the testing and optimization of the parameters,
; please see the following refs:

; S.J. Marrink, A.H. de Vries, A.E. Mark.
; Coarse grained model for semi-quantitative lipid simulations.
; JPC-B, 108:750-760, 2004.

; and for poly-unsaturated lipids:

;  S.J. Marrink, A.H. de Vries, T.A. Harroun, J. Katsaras, S.R. Wassall.
;  Cholesterol shows preference for the interior of polyunsaturated lipid membranes.
;  JACS, 130:10-11, 2008.
;
; and
;
; H.J. Risselada, S.J. Marrink.
; The molecular face of lipid rafts in model membranes.
; PNAS, 105:17367-17372, 2008.

;;;;;; DIPALMITOYL PHOSPHATIDYLCHOLINE  
;
; in general models PCs with saturated tail lengths C15-18

[moleculetype]
; molname 	nrexcl
  DPPC 		1

[atoms]
; id 	type 	resnr 	residu 	atom 	cgnr 	charge
  1 	Q0 	1 	DPPC 	NC3 	1 	1.0 
  2 	Qa 	1 	DPPC 	PO4 	2 	-1.0 
  3 	Na 	1 	DPPC 	GL1 	3 	0 
  4 	Na 	1 	DPPC 	GL2 	4 	0 
  5 	C1 	1 	DPPC 	C1A 	5 	0 
  6 	C1 	1 	DPPC 	C2A 	6 	0 
  7 	C1 	1 	DPPC 	C3A 	7 	0 
  8 	C1 	1 	DPPC 	C4A 	8 	0 
  9 	C1 	1 	DPPC 	C1B 	9 	0 
  10 	C1 	1 	DPPC 	C2B 	10 	0 
  11 	C1 	1 	DPPC 	C3B 	11 	0 
  12 	C1 	1 	DPPC 	C4B 	12 	0 

[bonds]
; i j 	funct 	length 	force.c.
  1 2 	1 	0.470 	1250
  2 3 	1 	0.470 	1250
  3 4 	1 	0.370 	1250
  3 5 	1 	0.470 	1250
  5 6 	1 	0.470 	1250
  6 7 	1 	0.470 	1250
  7 8 	1 	0.470 	1250
  4 9 	1 	0.470 	1250
  9 10 	1 	0.470 	1250
  10 11 1 	0.470 	1250
  11 12 1 	0.470 	1250

[angles]
; i j k 	funct 	angle 	force.c.
  2 3 4 	2 	120.0 	25.0 
  2 3 5 	2 	180.0 	25.0 
  3 5 6 	2 	180.0 	25.0 
  5 6 7 	2 	180.0 	25.0 
  6 7 8 	2 	180.0 	25.0 
  4 9 10 	2 	180.0 	25.0 
  9 10 11 	2 	180.0 	25.0 
 10 11 12 	2 	180.0 	25.0 
 
1687