  We investigate the translocation of a single stranded DNA (ssDNA) through a
pore, which fluctuates between two conformations, by using coupled master
equations (ME). The probability density function (PDF) of the first passage
times (FPT) of the translocation process is calculated, displaying a triple,
double or mono-peaked behavior, depending on the system parameters. An
analytical expression for the mean first passage time (MFPT) of the
translocation process is derived, and provides an extensive characterization of
the translocation process.
