Do any MHC Class II molecules with CLiP make it to the cell surface in a normal individuals? If so, are they recognized by T cells? Are there any microbes that have a CLiP mimic peptide to evade Class II presentation?

Another question today (and yes I know the answer to this one but I was still impressed by the question): wait, so if a self-protein got an amino acid change from a mutation like what would happen in a cancer cell, would that now be presented and act as a foreign antigen?