Antigenic variation is employed by a number of different protozoan parasites. Trypanosoma brucei (the model for study of protozoan antigenic variation) and Plasmodium falciparum are some of the most well studied examples of protozoan parasites that exhibit antigenic variation.ntigenic variation is the expression of various alternative forms of antigen on the cell surface. Whereas phase variation is the phenotypic switch that is usually reversible and is referred to as an ON-OFF switch.
NO: Amitriptyline is a tricyclic antidepressant for depression and some forms of anxiety, sometimes used for chronic pain or migraine. Xanax is a triazolobenzodiazepine or a benzodiazepine with an extra triazole ring structure. It is quite addicting and has a short half-life.
amitriptyline is in a group of drugs called tricyclic antidepressants amitriptyline affects chemicals in the brain that may become unbalanced amitriptyline is used to treat symptoms of depression amitriptyline may also be used for other purposes not listed in this medication guideo not use amitriptyline if you have taken cisapride propulsid or used an mao inhibitor such as isocarboxazid marplan phenelzine nardil rasagiline azilect selegiline eldepryl emsam or tranylcypromine parnate within the past 14 days