8. Variation in the strength of agglutination on the antibody identification panel may be observed. What are two possible explanations for this variation? 9. Would you expect the autocontrol to be negative or positive in the presence of the following antibodies? Why? 10. To rule out additional antibodies when interpreting the results of an antibody parsel, the antigens present on the reactive / (non-reacive) (encircle your answer) cells are crossed out. 11. When matching the pattem of reactions, only non-reactive cells heterozygous/ homoxygous for a particular antigen are crossed out. 12. List at least three factors which contribute to the frequency at which different antibodiet are produced. 13. Why is it important to use an antibody identification panel containing at least 10 12 cells? 14. What is the likelihood of finding compatible packed red cells for a patient with anti-K and anti-E?.