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.
Though strictly speaking, an antibody is not the same as an immunoglobulin; B cells can produce two types of immunoglobulins-surface immunoglobulins, which are B cell receptors; and secreted immunoglobulins, which are antibodies. So antibodies are one of two classes of immunoglobulins.he ability of an antibody to communicate with the other components of the immune system is mediated via its Fc region (located at the base of the Y), which contains a conserved glycosylation site involved in these interactions. The production of antibodies is the main function of the humoral immune system.