BioChain's tissue products are based on the sample repository network established following the IRB-approved ethical standard and procedures. BioChain's formalin fixed paraffin embedded (FFPE) tissue section line encompasses a large selection of tissue sections which are suitable for immunohistochemistry and in situ hybridization assays. The tissue sections are approximately 5 um thick. The cultured tumor cells were harvested, fixed, and embedded in paraffin using proprietary method. The paraffin embedded cell pellet was then sectioned and mounted on positively charged slides. For those customers who want to perform FFPE DNA and RNA isolation, BioChain can provide tissue section slices in tubes instead of mounting them on glass slides.