So the green portion are the intermediate filaments, the red portion are the thick filaments, the purple portion is a thin filament. And these brown regions are called dense bodies. And dense bodies are composed of a protein known as alpha Actinine. So basically, the contraction of the thin filament and the thick filament shown in this diagram causes these dense bodies to basically move closer. And these dense bodies are also connected to one another via these green sections. Our intermediate filaments.