This paper concerns the application of formal methods to biological systems, modeled specifically in BioAmbients , a variant of the Mobile Ambients  calculus. Following the semantic-based approach of abstract interpretation, we define a new static analysis that computes an abstract transition system. Our analysis has two main advantages with respect to the analyses appearing in literature: (i) it is able to address
properties which are more general than
properties; (ii) it supports, by means of a particular
, the validation of systems where several copies of an ambient may appear.