三级片视频播放,精品三级片在线观看,A级性爱视频,欧美+日韩+国产+无码+小说,亲子伦XX XX熟女,秋霞最新午夜伦伦A片黑狐,韩国理伦片漂亮的保拇,一边吃奶一边做边爱完整版,欧美放荡性护士videos

Monkey IgG, like other mammalian immunoglobulins G （IgG）, is a Y-shaped glycoprotein composed of two identical heavy chains （γ-chains） and two identical light chains （κ or λ）. Each chain contains constant （C） and variable （V） regions. The variable regions form the antigen-binding fragment （Fab）, responsible for recognizing specific antigens, while the constant region （Fc） mediates immune effector functions such as complement activation and binding to Fc receptors on immune cells. Monkey IgG shares structural similarities with human IgG, particularly in conserved domains like the Fc region, which is critical for cross-species applications.