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Mutants null for the cathepsin B-like cysteine proteinase gene (cpc) of Leishmania mexicana have been generated by targeted gene disruption. The gene deletion was confirmed using a polymerase chain reaction (PCR) method with cpc-specific primers and genomic DNA isolated from the mutants. cpc was re-expressed in the null mutants from an episomal vector. Re-expression of the enzyme (CPC) was detected...
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