TBX18 and infarction: For example, SSEA-1+ early cardiovascular progenitors expressing T, TBX5, and TBX18, were shown to engraft into non-human primate myocardium following infarction.35 Meanwhile, Tbx5 and Tbx18 are expressed in highly migratory and proliferative proepicardial cell lineages.36,37 These studies have demonstrated an increasingly appreciated observation that Tbx expression is related to the engraftment and function of CPCs following transplantation.