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.
Immunoglobulins (Ig) are glycoprotein molecules that function as antibodies. Since antibodies are present in the bloodstream or bound to cell membranes, they are considered to be a part of the humoral immune system. During an immune response, immunoglobulins bind to specific antigens (any foreign substance that is capable of inducing an immune response). Examples of antigens include bacteria, viruses, mold spores, dust mites, animal dander and fungus.