Chemical Ingredients [Chemical/Ingredient] Macromolecular Substances [Chemical/Ingredient] N0000167471 Macromolecular Substances Macromolecular Substances D046911 C1449655 Compounds and molecular complexes that consist of very large numbers of atoms and are generally over 500 kDa in size. In biological systems macromolecular substances usually can be visualized using ELECTRON MICROSCOPY and are distinguished from ORGANELLES by the lack of a membrane structure. C7759277952086 M0455942 469962 Macromolecular Compounds and Complexes