LPAR4 and myocardial infarction: By contrast, in adult mouse hearts, after MI, two types of LPAR4+ cells were identified by bone marrow transplantation experiments: cardiac-resident LPAR4+ cells (SOX17+), which possess some cardiac differentiation potential, and bone marrow-derived LPAR4+ cells (SOX17−), which function only as inflammatory cells and are not involved in cardiac repair [59].