Multiple sclerosis is a condition characterized by inflammatory, demyelinating lesions in the central nervous system separated in space and time. The Schwann cell is the cell in the peripheral nervous system that creates myelin. The oligodendrocyte is the glial cell in the central nervous system that creates myelin.
Agents are also referred to as real estate associates. A realtor is a real estate agent who is a member of the National Association of Realtors (NAR). To become a member, a real estate agent has to agree to abide by the association's standards and uphold its code of ethics.
A broker is an independent party, whose services are used extensively in some industries. A broker's prime responsibility is to bring sellers and buyers together and thus a broker is the third-person facilitator between a buyer and a seller. An example would be a real estate broker who facilitates the sale of a property.