The hookworm Ancylostoma canium represents a serious health problem, not only for animals but also for humans. These blood-feeding parasites produce various proteolytic enzymes in order to digest the host hemoglobin. The female worm ingests more blood than does the male. It is not known whether this difference is accompanied by expression of sex-specific proteinases. The identification of new genes related either to the developmental process of maturation of each sex or to the proteinases secreted by these worms could provide researchers with new tools to be used in control programs for this important parasite. The differential-display technique was used to compare the gene expression patterns of adult male and female worms in order to find specific genes that could be used as new targets in the control strategies for this parasite.
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