Expression of VSP in muscle fibers. Transmitted light images and corresponding confocal images of a portion of muscle fibers expressing Ci-VSP using the pIRES-EGFP plasmid (A) and Dr-VSP N-terminally tagged with EGFP (B). In B, the white trace superimposed on the green image shows the typical banded pattern of the fluorescence along the longitudinal axis of the fiber.