The seven dirty little secrets of major histocompatibility complex class I antigen processing.

Every field has its dirty little secrets (DLSs): assumptions based on flimsy evidence, findings that directly contradict prevailing models or so beg comprehension that they cannot even seed reasonable alternative hypotheses. Although our natural tendency is to hug these DLSs, they should be exposed, for it is these gaps in our understanding that point to the path to enlightenment. Here, I discuss some of the DLSs of major histocompatibility complex class I antigen processing.