"As of 2011, at least six types of synthetic sugars have been shown to form nucleic acid backbones that can store and retrieve genetic information" -- http://en.wikipedia.org/wiki/Xeno_nucleic_acid
"These systems [XNA] can be used to create novel peptides and proteins [including symmetrical structures] that offer enhanced activities or even completely new properties over their natural protein counterparts. Furthermore, many artificially engineered nucleic acids and proteins have found useful applications as biosensors, diagnostic agents, and therapeutic drugs." -- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3562584/
Biggest threat to Transformers: They are becoming human zombies.