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The serpin gene of Haemonchus contortus (hc-serpin) was cloned and characterized in this study. Specific primers for rapid amplification cDNA ends (RACE) were designed based on the expression sequence tag (EST, BM173953) to amplify the 3′- and 5′-ends of hc-serpin. The full length of the cDNA of this gene was obtained by overlapping the sequences of 3′- and 5′-extremities and amplification by reverse...