Tissues are snap frozen in liquid nitrogen immediately after excision, and embedded in OCT. All US Biological’s frozen tissue products, including frozen tissue arrays, frozen tissue sections, and frozen tissue panels, can be used for both immunohistochemistry and in situ hybridization. These products are ideal for rapid cellular localization of RNA and protein expression, especially for antibodies that don't recognize paraffin embedded tissue. At least one of the tissue slides from each lot was stained with H & E to ensure quality. ||Frozen Tissue Array contains up to 45 tissue spots from different tissues. Each tissue core size is 2mm diameter. Tissue arrays are 5-8um in thickness , mounted on positively charge glass slides and fixed by cold acetone. A reference chart shows all the tissue names and their respective position on the array.||Storage and Stability:|Store at -70°C. Stable for 6 months after receipt.