Table 1. Polymerization of CpA depends on salt, temperature, and peptide concentration.

	1.5 M NaCl
	25°C			0.75 M (NH4)2SO4
Parameters	100 μM	150 μM	4°C	25°C	4°C
s20,W	6.1	6.3	6.9	5.0	5.2
D20,W	1.38	0.97	0.38	0.62	0.11
Molecular mass, kDa	420	630	1,800	780	4,600
No. of monomers	120	180	500	220	1,300
f/f0	3.3	4.2	7.7	6.1	19
L × d	180 × 1.9	288 × 1.8	435 × 2.5	513 × 1.5	1,955 × 1.9

The samples contained 100 μM peptide (unless stated otherwise) and 10 mM Tris·HCl, pH 8.0. s_20,W and D_20,W are standardized values for pure water at 20°C for both the Svedberg values (in units of 10^-13 s) and diffusion constants [in units of cm²·s^-1 (× 10^-7)], respectively, as measured by sedimentation velocity experiments (Optima XLA analytical ultracentrifuge, Beckman Instruments). The approximate molecular mass (10³ Da) was calculated from the Svedberg values and diffusion constants by using dcdt+. The number of monomers is calculated by dividing the measured molecular mass with the monomer theoretical molecular mass. f/f₀ is the frictional ratio relative to that expected for an anhydrous sphere. L × d are the axial and lateral dimensions of the polymers, in nm, when the data are modeled as a cylinder.