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| Bio-assay dish, PS. Suitable in agar diffusion assay. Lined with wet filter paper it is also useful as an incubation chamber for in situ hybridization. Large growth area. Sterile. |  |
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| Bio-assay dish, PS. Suitable in agar diffusion assay. Lined with wet filter paper it is also useful as an incubation chamber for in situ hybridization. Large growth area. Sterile. | |
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