(Depletion of ATP) plays a central role in cellular maintenance both as a chemical for biosynthesis and as the MAJOR SOURCE OF ENERGY. utilized in numerous biosynthetic reactions, and is INCORPORATED INTO COFACTORS as well as NUCLEIC ACIDS It is required for MUSCLE CONTRACTION and polymerization of the cytoskeleton, fueling cellular MOTILITY, CELL DIVISION, VESICULAR TRANSPORT, & MAINTENANCE OF CELL MORPHOLOGY.