In the post devoted to a recent image taken by Opportunity https://www.facebook.com/PianetaMarte.MdM/photos/a.1625578140858706.1073741828.1612043482212172/1658008487615671/?type=3 ), I mentioned green spots observed during the Viking mission.
This is the 1978 article by Dr. Gilbert Levin cited in the post indicated above….
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