Fig. 1. Drosophila melanogaster cardiac tube remodelling. (A,B) Larval (A) and adult (B) cardiac tubes, stained with phalloidin for polymerised actin (F-actin), are shown at the same magnification. Scale bars: 50 µm. (C) Scheme of larval and adult cardiac tube. (Top) Larval cardiac tube. The svp, tin, Ubx and abdA expression patterns are indicated. (Bottom) Adult cardiac tube. svp and tin expression are indicated according to Molina and Cripps (Molina and Cripps, 2001) and to our own observations. The adult organ is formed by larval myocytes from T1 to A5 segments. Cardiac myocyte morphological modifications (including size, myofibril content and orientation, and innervations) are schematized (see Fig. S2 in the supplementary material). a.m., aorta myocytes; h.m., heart myocytes; t-c.m., terminal chamber myocyte.