[Virginia-American]

I ask what would the "comment" look like? Is it written in english?

To a literalist Bible-believer, they'd be in Hebrew, I guess. To a Muslim, the'd be in Classical Arabic. To a Hindu, in Sanskrit.....

Rather like Sagan's "Cosmos", with the message in Pi.

[dark_lord]

Plain old adenine, thymine, guanine, and cytosine. Again, see here for an interesting article. Or here for another paper on hiding encrypted messages in DNA.

Of course, the problem is, to break a code you have to understand the language that the cipher has encoded. And of course double or triple pass encoding makes it even tougher. The real question then, is this: is it possible to tell if there exists an encrypted message, or just random noise? That is, would it be possible to parse a "junk" DNA sequence and determine that yep, this here is a piece of bona fide encrypted code -- without knowing the key, and being able to determine it is something encrypted and not random junk?