Published customer image: . Mouse anti Human desmoplakin 1/2 antibody, clone DP-2.15 used for the detection of desmoplakin expressing human cardiomyocytes by immunofluorescence. Image caption: . Cardiac matrix coatings increase hESC derived cardiomyocyte maturation compared to the standard gelatin substrate. hESC-derived cardiomyocytes were cultured on gelatin (a and c) or cardiac matrix (b and d) and stained for Titin M8 (red), desmoplakin (green), or nuclei (blue). Cell cluster area (e), number of nuclei per cluster (f), and average desmoplakin positive area (g) were measured and compared between the two coatings. Cardiomyocytes had an increased cluster area and number of nuclei at both day 35 and 112. At day 112, the average desmoplakin immunoreactive area was significantly greater on the cardiac matrix, with localization observed at the lateral ends of the cardiomyocytes (arrows), indicating the formation of desmosomes and a more mature phenotype. **p PLoS ONE 5(9): e13039 .