Cells

Chlorophyll is located in the thylakoid membranes inside the chloroplasts. Thylakoids are the sites of the light-dependent reactions of photosynthesis.

In the structure of microtubules, the peripheral doublets of the axoneme are interconnected by proteins known as nexins.

Adenosine Triphosphate ({ATP}) is universally known as the cell's "energy currency". It stores energy in high-energy phosphate bonds. During cellular work, ATP is hydrolyzed to {ADP} + {Pi}, releasing energy.