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A group of RIKEN researchers, which did not include any authors of the original STAP papers, analysed the genomes of purported STAP cell lines that remained at the CDB. They found multiple instances of contradictory data, the result of what they call “contamination” of supposed STAP cells by other known cell types. The analyses show that all remaining purported STAP stem cell lines, for example, were genetically identical to embryonic stem cell lines that already existed in the laboratory.
