Immunoglobulin A only weakly. IgA exists in two isotypes, IgA1 and IgA2. They are both heavily glycosylated proteins. While IgA1 predominates in serum (~80%), IgA2 percentages are higher in secretions than in serum (~35% in secretions); the ratio of IgA1 and IgA2 secreting cells varies in the different lymphoid tissues of the human body: Both IgA1 and IgA2 have been found in external secretions like colostrum, maternal milk, tears and saliva, where IgA2 is more prominent than in the blood. Polysaccharide antigens tend to induce more IgA2 than protein antigens. Both IgA1 and IgA2 can be in membrane-bound form. ("see B-cell receptor")
Death Is Called Engelchen his comrades, his fights with Germans in Slovak mountains and his love, Marta, who acted as a spy for the resistance. He also remembers Engelchen, who is responsible for death of many Pavel's friends and for a massacre of 2 mountain villages. Marta comes to visit Pavel in the hospital to say goodbye. Her work as a spy made her look like a German collaborator to some and it earned her hate. After some time, Pavel recovers and leaves hospital to find Engelchen. Death Is Called Engelchen Death Is Called Engelchen () is a 1963 Czechoslovak war film directed by