Fig. 1

Structure of fast and slow muscles in larval zebrafish. Top panel, lateral view of a 5-dpf larval zebrafish. The position for the cross section in the bottom panel is shown. Scale bar, 300 µm. Bottom panel, cross section view computed from confocal images of a Tg(actc1b:GFP); Tg(smyhc1:tdTomato) fish. In this compound transgenic fish, GFP (green signal) and tdTomato (magenta signal) are expressed in fast and slow muscles, respectively. Only the right half of muscles is presented. Scale bar, 30 µm