Within bioinformatics, intrinsic Noise Analyzer (iNA) is an open source software for studying reaction kinetics in living cells.
[2][3] Under well-mixed conditions, the concentrations in living cells are often modeled by a set of deterministic reaction rate equations.
This approach frequently becomes inaccurate when some molecular species are present in low molecule numbers per cell because of the randomness inherent in chemical reaction kinetics.
[5] This method, however, often becomes computationally inefficient due to the large amount of sampling needed for accurate statistics.
iNA provides a more efficient way to obtain the desired statistics via the system size expansion of the Chemical Master Equation, a systematic analytical approximation method.