MCQOPTIONS
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				| 1. | 
                                    The function of IgD is______________? | 
                            
| A. | Antigen recognition by B cells | 
| B. | Localization protection in external secretion | 
| C. | Compliment activation | 
| D. | Reagin activity | 
| Answer» B. Localization protection in external secretion | |