evidence: Documents obtained by The Intercept contain new evidence that the Wuhan Institute of Virology and the nearby Wuhan University Center for Animal Experiment, along with their collaborator, the U.S.-based nonprofit EcoHealth Alliance, have engaged in what the U.S. government defines as "gain-of-function research of concern," intentionally making viruses more pathogenic or transmissible in order to study them, despite stipulations from a U.S. funding agency that the money not be used for that purpose. [...] The experiment also raises questions about assertions from Fauci and NIH Director Francis Collins that NIH-funded projects at the Wuhan Institute of Virology did not involve gain-of-function research. In May, Fauci testified before Congress: "The NIH has not ever and does not now fund gain-of-function research in the Wuhan Institute of Virology." The documents do not establish whether Fauci was directly aware of the work. [...] In October 2014, the federal government put a moratorium on funding gain-of-function research on potential pandemic pathogens that could be "reasonably anticipated" to lead to spread in humans, as outlined in a 2017 guidance from the Department of Health and Human Services. In December 2017, the moratorium was lifted and replaced with new guidelines for oversight of research using potential pandemic pathogens. The grantees reported that the humanized mouse experiment was done between June 2017 and May 2018. Gain-of-function research was thrust into the spotlight again in 2020, amid speculation that the Wuhan Institute of Virology had conducted such research and that it was somehow linked to the pandemic.