BioChain's tissue products are based on the sample repository network established following the IRB-approved ethical standard and procedures. The tissues are immediately put in liquid nitrogen after being excised, and then identified by a board-licensed pathologist. Patient demographic and disease related history data are available. BioChain's frozen tissue section line encompasses a large selection of tissue sections which are good for immunohistochemistry and in situ hybridization. The tissue sections are approximately 5-10 um thick.