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" ... In a recent presentation at the Astrobiology2017 conference in Coyhaique, Chile, Williams noted that she and colleagues studied three hot springs sites in Iceland and found that found that organic fatty acid biosignatures are indeed preserved in siliceous sinter rock, a silica-rich rock that forms from certain hot springs. What’s more, they are detectable with a benchtop version of the Curiosity rover’s TMAH experiment. ... "