Pseudopodia Bacteria Phagosome 的 ysosome phagolysosome Class II MHC oo0 Antigenic peptide/class II MHC Exocytosed degraded material Mφ吞噬处理入侵细菌及提呈抗原的机制M吞噬处理入侵细菌及提呈抗原的机制