男女一区二区三区_中文日本字幕mv在现线观看_又黄又爽又色又刺激的视频_久久久久黄_性高潮在线观看_91精品久久久久久久久_美女裸体色黄污视频网站_亚洲生活片_色噜噜噜_波多野结衣黄色片

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