Impact of clinical variables on CB-MSC behavior. Clonal efficiency stratified according to the presence of myocardial infarction (MI) in the patient’s history. Here, only serum from patients with previous MI has signficantly reduced clonality. Please note the limitations of this subgroup analysis that are discussed in the text. The boxplot indicates interquartile range (box), median (line), range (whiskers) and outliers (+/−).