As per Gheorghe Paun, the separation is of the Euclidean space into a finite "inside" and an infinite "outside". The selective communication is where the computing comes in.

Graphical representations may have numerous elements, according to the variation of the model that is being studied. For example, a rule may produce the special symbol ?, in which case the membrane that contains it is dissolved and all its contents move up in the region hierarchy.

The variety of suggestions from biology

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