The 25x Wash Buffer A (WB2) is intended to be used for washing steps in fluorescence in situ hybridization (FISH) procedures on formalin-fixed, paraffin-embedded specimens. The 25x Wash Buffer A is intended to be used in combination with Gene Bio Solution probes and the Gene Bio Solution FISH-Tissue Implementation Kit. The product is intended for professional use only. All tests using the product should be performed in a certified, licensed anatomic pathology laboratory under the supervision of a pathologist/human geneticist by qualified personnel.