對雛鳥胚胎肢體進行肌球蛋白重鏈的免疫染色。 在胚胎發育過程中，肢體的肌肉被重塑，形成解剖學上不同的肌腹，由沿著不同方向平面排列良好的肌纖維組成。
Immunostaining of myosin heavy chain in the embryonic avian limb.
During embryonic development, the muscle mass of the limb is remodeled to form anatomically distinct muscle bellies composed of muscle fibers well-aligned along distinct orientation planes.