aµdt = hµcµdt = average probability that a reaction Rµ will occur in the next time interval dt Cµdt = average probability that two reactant molecules will collide according to Rµ in the time interval dt hµ = total number of possible reaction combinations e.g: Homocysteine conversion to metheonine is reaction six (R6): R6: Five MTHF+Hcy→THF+Met Assuming there is Z molecules of five MTHF  &  X molecules of Hcy: h1 = X*Z = number of possible reaction combinations X*Z* C6dt = Probability that R6 will occur inthe next time interval. Where C6 is the stochastic rate constant for reaction 6

Table 3: Example of a Stochastic Reaction.