> The trouble with mirror cells is that they could probably evade most of the barriers that keep ordinary organisms in check. To fight off pathogens, for example, our bodies must first detect them with molecular sensors.
> Those sensors can only latch onto left-handed proteins or right-handed DNA and RNA. A mirror cell that infected lab workers might spread through their bodies without triggering any resistance from their immune systems.
It’s clear that RNA wouldn’t be complementary to mirror RNA, but antibody binding is more complex than RNA hybridization. Is it a foregone conclusion that antibodies couldn’t bind to mirror antigens?
(Degrading mirror proteins, as mentioned elsewhere in OP, does seem like a bigger obstacle.)