A kit for altering allogeneic human cells for a human recipient where the kit includes a set of lentivirus vectors where each of the lentivirus vectors expresses a sequence targeting a consensus conserved nucleic acid sequence, which when expressed in cells, functions as a negative modulator for nucleic acid encoding a domain having a mismatch in an HLA protein and where the set of lentivirus vectors includes individual lentivirus vectors that correspond to individual HLA mismatches for a set of HLA mismatches that consist of HLA Class I mismatches and at least one HLA Class II mismatch and where the kit is for treatment of human cells by an appropriate subset of the set of lentivirus vectors based at least in part on a determined subset of the set of HLA mismatches between a human donor and a human recipient or between human cells and a human recipient.