Abstract
Alterations to organ biology caused by transplantation can have major impacts on the outcome. Tissue-resident lymphocytes normally maintain an organ's immunity and function and are transferred during transplantation. Here, we provide a detailed protocol for the isolation of leukocytes, including tissue-resident lymphocytes, from transplanted livers and hearts in mice. Phenotypic and functional analysis of conventional and unconventional T cells by flow cytometry is included. This protocol can also be used for the effective isolation of leukocytes from non-transplanted livers and hearts. For complete details on the use and execution of this protocol, please refer to Prosser et al. (2021).