Table 2 Rate constants in the model ( μ M/hr)

k ₁ = 10^-11

k _-1 = 375

iAs ⇆AsTG

k ₂ = 10^-5

k _-2 = .25

MMAs ⇆MAsDG

k ₃ = 10^-3

k _-3 = 10^-3

DMAs ⇆DAsG

k ₄ = ln(2)/2.5

GSH decay

k ₅ = 100

k ₆ = .1

Reduction of MMAs^V

k ₇ = 5

k ₈ =.1

Reduction of DMAs^V

V ₁

K _m = 4.6

K _m for [iAs]

$K_i^A=1.26$

$K_i^M=40$

V ₂

K _m = 4.6

K _m for [iAs]

$K_i^{A2}=40$

$K_i^{M2}=\sqrt{6}$