Table 1. The first order rate constants of DTNB and OPT reacting with native tau and 0.005% formaldehyde-treated tau.

	In the presence of DTNB		In the presence of OPT
	Native tau	Formaldehyde-treated tau	Native tau	Formaldehyde-treated tau
Fast phase	130.2±7.01	43.5±3.01	81.3±6.13	7.7±0.91
Slow phase	23.4±3.42	5.6±0.87	32.1±2.05	7.4±0.79

Data are in 10⁵ s⁻¹.