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If you use rabbit anti-rabbit caspase3. It will be OK. The second, anti rabbit Ab, will only react with the rabbit primary anti caspase Ab. However, there are certain problems that could arise, so you need to give us some more details re your detection system, the tissue and the tissue prep you are wanting to use. Also, which anti Caspase 3 Ab you are using. Also....sorry, are you wanting to detect CLEAVED caspase 3 only? Or just Caspase 3?