{HEAD ~ Critical 5′ and 3′ control elements} from Cnidaria can be identified by cloning {TAIL ~ 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  
identified by cloning
{ HEAD ~ Critical 5′ and 3′ control elements } from Cnidaria can be identified by cloning { TAIL ~ 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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