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Fig. 1. Cell lineages of Eve- and Tin-positive pericardial cells and anterior Tin-positive cardioblasts. High-magnification dorsal views of stage 15-16 embryos labeled for ß-galactosidase (brown) to identify clones and Eve (A) or Tin (B-D) (black). (A) Clone that contains two Eve-positive pericardial cells (arrows). (B) Clone that contains two Tin-positive pericardial cells (arrows). (C) Anterior heart clone that contains one Tin-positive cardioblast (arrow) and one Tin-positive pericardial cell (arrowhead). (D) Anterior heart clone that contains one Tin-positive cardioblast (arrow) and one Tin-negative pericardial cell (arrowhead). Anterior is towards the left.