That sounds slightly different than what I mean. You appear to be saying: "It is possible something DNA-like could be constructed from different materials in d

That sounds slightly different than what I mean. You appear to be saying: "It is possible something DNA-like could be constructed from different materials in different codes and it would still be viable". I was saying: "It is possible hydrogen, carbon, oxygen, etc. will form into DNA as long as suitable conditions exist and this is common enough occurrence that multiple sources of DNA independently developed across the galaxy/universe". I only say this to assert that the appearance of DNA from a source other than Earth should not necessarily imply a common ancestor.