What is an example of granum?

A granum is a stack of thylakoids found within the chloroplasts of plant cells, which plays a critical role in photosynthesis. An example of granum can be observed in the chloroplasts of spinach leaves, where multiple grana (plural of granum) contain chlorophyll that captures light energy. These structures facilitate the light-dependent reactions of photosynthesis, converting light energy into chemical energy.