Most typical strains are morphologically and biochemically homogenous with a few exceptions. Many brand name drugs have cheaper generic drug substitutes that are therapeutically and biochemically equivalent. Under some conditions proteins will not fold into their biochemically functional forms. Similarly, most biochemically significant processes are catalysed. The -isomer is used to biochemically form proteins, coded for by DNA. These microorganisms are known for their affinity for hydrocarbons, both biochemically and physically. This allows myricetin to form a complex with oxygen and biochemically target the DNA molecule. Molecular-weight size markers can also be biochemically altered. The glycerate is a biochemically significant metabolic intermediate in both glycolysis and the Calvin cycle. They are biochemically inert, and have no effect on any known disease. It was biochemically characterized as a 140 kDa complex. Biochemically, anoxygenic photosynthesis is very different from oxygenic photosynthesis. The 5-hydroxyindole skeleton is the foundation for a number of biochemically important molecules. A common biochemically important butenolide is ascorbic acid (vitamin C). This is because the fungi used are biochemically very active when compared with starter bacteria.