| Summary: | The first mathematical model of a splicing system that was analyzed in the framework of Formal Language Theory was developed in 1987 by Head. This model consists of
a finite alphabet, a finite set of initial strings over the alphabet, and a finite set of rules that act upon the strings by iterated cutting and pasting, generating new strings. In this paper, a new notation for writing rules in a splicing system and a new extension of splicing systems is introduced in order to make the biological process transparent. These are called Yusof-Goode rules, and they are associated with Yusof-Goode splicing systems. Four different classes of splicing systems are
discussed: null-context, uniform, simple and SkH systems. Also, counterexamples are given to illustrate relationships between these splicing system classes.
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