A fat quarter of fabric is a one-fourth yard cut that usually measures 18 x 22. To create a fat quarter, cut a half-yard of fabric -- 18 along the fabric's lengthwise grain -- then cut that piece in half at its midpoint as illustrated.
An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses. The antibody recognizes a unique molecule of the harmful agent, called an antigen, via the variable region.hough 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.
Immunoglobulin M, or IgM for short, is a basic antibody that is produced by B cells.IgM is by far the physically largest antibody in the human circulatory system. It is the first antibody to appear in response to initial exposure to an antigen.The spleen, where plasmablasts responsible for antibody production reside, is the major site of specific IgM production.gM forms polymers where multiple immunoglobulins are covalently linked together with disulfide bonds, mostly as a pentamer but also as a hexamer. IgM has a molecular mass of approximately 970 kDa (in its pentamer form). Because each monomer has two antigen binding sites, a pentameric IgM has 10 binding sites.