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" ... The first compelling piece of evidence came from the instruments on board NASA’s Mars Viking landers in 1976. There were three biology experiments performed: a gas exchange experiment, a labeled release experiment, and a pyrolytic release experiment, followed-up by a gas chromatograph mass spectrometer experiment. The labeled release experiment yielded a positive result when performed on both Viking landers, but only the first time the test occurred. All other experiments came back negative. ... "