So these are known as very long chain fatty acids or simply VLCFA. Now, what exactly the major difference between the beta oxygen process that takes place inside our mitochondria and inside proxosomes? Well, the major difference is step one of beta oxidation. So remember that in step one of beta oxidation, inside the matrix of the mitochondria, we have an enzyme that catalyze the reaction in which we basically oxidize the fatty acid and that helps us generate an Fad H two molecule. Now, what about inside the proxosomes? Well, inside the proxysome, it's this step that takes place.