Anticoagulation and antiplatelet agents are given to prevent the narrowed artery from occluding. This promotes drainage and healing by softening the hardened oil that is occluding the duct. A plaque is formed and proliferate to a larger size, gradually occluding the blood flow. Repressors often physically occupy the promoter location, occluding RNA polymerase from binding. ACP sees its main use as an occluding agent, which aids in reducing sensitivity. OxyS RNA represses translation by binding to Shine-Dalgarno sequences thereby occluding ribosome binding.