By choosing a tandem model, you will be less likely to outgrow your trailer; the extra upfront expense may be worth it in the long run. While towing level is not a factor for single axle models, level towing is a must for a tandem axle trailer. If the load is not level it can cause extra wear and tear on one set of axles, and reduce the life of your tires. The initial investment for a tandem trailer is higher than the cost for a single axle model.
The five primary classes of immunoglobulins are IgG, IgM, IgA, IgD and IgE. These are distinguished by the type of heavy chain found in the molecule.
a protein of animal origin with known antibody activity. Immunoglobulins are major components of what is called the humoral immune response system. They are synthesized by lymphocytes and plasma cells and found in the serum and in other body fluids and tissues, including the urine, spinal fluid, lymph nodes, and spleen.gG is the only immunoglobulin that crosses the placenta and is the major component of passive maternal antibody transfer via colostrum and yolk. IgM is the first antibody produced in the primary immune response.