TY - RPRT TI - Two genetically identical antigen-presenting cell clones display heterogeneity in antigen processing. AU - M T Michalek AU - B Benacerraf AU - K L Rock PY - 1989 DO - 10.1073/pnas.86.9.3316 UR - https://pubmed.ncbi.nlm.nih.gov/2470101/ ID - 2470101 ER -