Fig. 4.

Transmission Electron Microscope (TEM) micrographs showing a longitudinal cross section of the muscle morphology of healthy, uninfected M. rosenbergii muscle tissues. The red circle indicates the area selected for a deeper look, focusing on fiber uniformity within the muscle bundles. Muscle fibers appear highly uniform, with the bundle structures well defined and orderly. The A band of the muscle tissue is also very clearly visible even at the lower resolution. A: TEM image showing healthy M. rosenbergii muscle fibers at a magnification of 5000×. (B) TEM image showing healthy M. rosenbergii muscle fibers at a magnification of 10000×.