I remember reading that scientist were making cells (I assume bacteria), that used differently oriented proteins to create a whole new class of life. Because apparently right and left aligned proteins don't interact in same way, cells made in such manner would behave similarly but couldn't be interacted with differently aligned bacteria/virus.
However I can't find any proof this story was true? I could be wrong about details. Is there a similar mechanism that would allow a whole case of twin (contain DNA, and most molecules that regular cells posses) cells that couldn't interact with existing bacteria?