BioChain's tissue arrays or tissue microarrays (TMAs) are a useful tool in biomarker research and drug target validation. It consists of paraffin blocks that are assembled in array fashion to allow multiplex histological analysis. BioChain's TMAs provide a valuable tool for analysis of protein, RNA, or DNA molecules in oncology, both the malignant and metastatic markers. TMAs can also be constructed with tissues from other diseases and species.