手机毛片在线观看_国产日韩换脸av一区在线观看_你懂的网站在线观看网址_亚洲国产毛片aaaaa无费看_免费一级a毛片_99re在线精品_朝桐光av一区二区三区_日韩成人激情_亚洲欧美精品在线观看

Immunoglobulin M (IgM) normally constitutes about 10% of serum immunoglobulins. IgM antibody is prominent in early immune responses to most antigens and is largely confined to plasma due to it's large size. Monomeric IgM is expressed as a membrane bound antibody on the surface of B cells and as a pentamer when secreted by plasma cells. Due to it's high valency IgM is more efficient than other isotypes is binding antigens with repeating epitopes (virus particles and red blood cells) and is