Poisson-beta            Poisson-beta Distribution
chf_1F1                 Kummer's (confluent hypergeometric) function
fit_params              Functions to estimate parameters of probability
                        distributions by fitting the distributions
                        using optim()
gmRNA                   Gillespie algorithm for mRNA generating
                        processes
nlogL                   Negative log Likelihood functions for Poisson,
                        negative binomial and Poisson-beta
                        distributions
