Table 1.

Composition of the Measurement Buffers Used in This Work

Measurement buffers	Buffer Components
A [Standard]	25 mM HEPES-KOH (pH 7.5) (Sigma-Aldrich; St. Louis, MO)
	0.1 mM EDTA (Sigma-Aldrich)
	50 mM KCl (Merck, Darmstadt, Germany)
	0.01% (w/v) BSA (Sigma-Aldrich)
	0.025% (w/v) PEG (Sigma-Aldrich)
	0.025% (w/v) PVA (Sigma-Aldrich)
B	10 mM HEPES (pH 7.5) 100 mM KCl 0.2% (w/v) BSA
	0.1% (w/v) Tween-20 (Sigma-Aldrich) 10 mM NaN3 (Merck)
C	10 mM HEPES (pH 7.5) 100 mM KCl 0.2% (w/v) BSA
	0.1% (w/v) Tween-20 10 mM NaN3 2 mM MgCl2