Updated publication reference for PubMed record(s): 30635789. LV fibroblasts were isolated from control (day 0), and infarcted regions at day 1, day 3, and day 7 after myocardial infarction (MI). Cells were isolated in DMEM in 10% fetal bovine serum and were seeded into 6-well plates and were allowed to grow to 80% confluence in DMEM supplemented with 10% fetal bovine serum (FBS). Cells were serum starved (DMEM + 0.1% FBS) for 18 h and then media was changed and secretome was collected after 24 h. The sample sizes are n=3 biological replicates for each time point.