Table 1.

Constants used in the Simple Gene Expression Model

Constant	Tabasco	Species-Level
kon (M-1s-1).	4E7	4E7
koff (s-1).	4	4
kiniton (s-1).	1.2	1.2
% runoff	0	N/A
krecyc (s-1).	0	N/A
kelong (s-1)	0.23	0.23
kprot (s-1)	0.645	0.645
kribon (M-1s-1)	1.15E4	1.15E4
kclear (s-1).	0.14*	0.1308
rib elongation (s-1)	20	20
mRNA deg (s-1).	2.5E-3	2.5E-3
protein deg (s-1)	7E-4	7E-4

We compared two models of expression of a single-gene varying only if mRNA and protein elongation reactions are treated as series of individual steps or a single lumped reaction (Figure 3; Figure 6). The kclear rates do not exactly match because of small differences in the model structures (see text). The Tabasco constant for kclear was adjusted to ensure the steady-state levels of mRNA and protein were equivalent in both simulations.