TABLE 3.

Number of contacts between species in the polyanion-lysozyme systems.

	TPP system
	Lysozyme	Polyanion	TRIS	$\mathbf{N}{\mathbf{a}}^{\mathbf{+}}$	$\mathbf{C}{\mathbf{l}}^{\mathbf{-}}$	$N_X$
Lysozyme	15.1	17.5	7.3	3.2	0.8	2
Polyanion	17.5	0.1	8.1	30.5	0.0	5
TRIS	7.3	8.1	0.4	0.2	0.0	3
${\text{Na}}^{+}$	3.2	30.5	0.2	-	0.1	24
${\text{Cl}}^{-}$	0.8	0.0	0.0	0.1	0.0	18
Water	866.1	76.8	34.9	100.5	133.2	-

	CIT system
Lysozyme	16.4	16.7	10.2	2.4	0.8	2
Polyanion	16.7	0.7	9.0	7.7	0.0	5
TRIS	10.2	9.0	0.6	0.1	0.0	3
$\mathrm{N}{\mathrm{a}}^{\mathrm{+}}$	2.4	7.7	0.1	0.0	0.1	15
$\mathrm{C}{\mathrm{l}}^{\mathrm{-}}$	0.8	0.0	0.0	0.1	-	18
Water	864.1	77.1	31.1	77.3	133.0	-