{HEAD ~ Critical 5′ and 3′ control elements} from {TAIL ~ Cnidaria} can be identified by cloning PCR amplified portions of 5′ and 3′ flanking sequences of known metazoan genes into reporter expression vectors, and measuring their effect on reporter expression following transformation of the metazoan hosts  
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{ HEAD ~ Critical 5′ and 3′ control elements } from { TAIL ~ Cnidaria } can be identified by cloning PCR amplified portions of 5′ and 3′ flanking sequences of known metazoan genes into reporter expression vectors , and measuring their effect on reporter expression following transformation of the metazoan hosts
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