After this week’s oral arguments in the patent dispute over the CRISPR-Cas9 genome editing technology, the Broad Institute of Harvard and MIT seemed to be sitting pretty: the three judges peppered the University of California’s attorney with many more skeptical questions.

And now it seems the Broad may have another ace up its sleeve: A filing claiming its scientist conceived the genome-editing invention more than a year before his rival at UC published her seminal paper on CRISPR in June 2012.

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