They're already testing artificial red blood cells that work as well as real ones.
Life beyond the most simple bacteria is a LONG way off. Sythia isn't perfect--they don't have everything figured out yet, and not all the genes they put in switched on the way they were supposed to. This is because sequencing is more complicated than just putting it in there--it has to be in the right order. Synthia is an amazing achievement, but it really just demonstrates how much we still have to learn.
A red blood cell doesn't contain DNA, because it has no nucleus.
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