Frozen tissue slides suitable for use in identifying cellular localization of RNA or protein using in situ hybridization or immunohistochemistry. Tissue was frozen in liquid nitrogen immediately after excision. The section of 5-10um thickness is mounted on a positively-charged glass slide. The slide is fixed by cold acetone. One of the tissue section slides from each lot was stained with H & E to ensure the quality. It is an ideal product for rapid cellular localization of RNA and protein expression.