This is probably the single most significant parameter aside from the solvent model (the Flory parameters). The persistence length is notated here as and has the units of nucleotides (nt). The persistence length is also sometimes also referred to as the Kuhn length. Its magnitude indicates the extent of correlation of a group of monomers in a given polymer. For most polymers, is greater than the number of monomers. In a sequence of maximum stretched out length (units of length), and monomer separation distance (units of length), the polymer can be expressed as a collection of effective monomers of number ( ) whose separation distance is : .