亚洲色图清纯唯美I国产92视频I欧美日韩视频一区二区I四虎福利视频I日本免费中文字幕I古代玷污糟蹋np高辣h文I成人资源站I国产欧美一区二区三区四区I成人精品免费网站I亚洲天堂狠狠干I天天操天天看I99国产精品久久久久久久日本竹I亚洲自拍网站I激情久久久I午夜影视剧场I在线国产区I精品免费久久久I农村少妇I女同一区二区三区I超碰成人免费在线I日韩视频在线观看免费Iav夜夜I欧美激情精品久久久久久变态I黄色a大片Iav成人资源I97理伦

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