If the protein source was obtained elsewhere, how is it determined that it was not cross contaminated with bovine SRM from countries not of negligible BSE risk?
如果这些蛋白源来自于其它地方，那么如何确保不被来自于非疯牛病风险可忽略国家的特殊风险物质污染。
If the protein source was obtained elsewhere, how is it determined that it was not cross contaminated with bovine SRM from countries not of negligible BSE risk?
如果这些蛋白源来自于其它地方，那么如何确保不被来自于非疯牛病风险可忽略国家的特殊风险物质污染。
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