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Sterility zones within the BSC. BSC with blue surgical drapes creating a sterile working surface. Zone 1 depicted by yellow arrows represents the region of the BSC where sterile materials are passed to the surgeon. Zone 2 depicted by white arrows represents the region of the BSC where procedures are performed. Zone 3 depicted by red arrows represents the region of the BSC where nonsterile materials protected by sterile external covering are positioned.
