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 /ËaemÉªËtrÉªptÉªliËn/ (ËÃ¦mÉªËtrÉªptÉªliËn, Elavil, Endep, levate and many) others is the most widely used tricyclic (ANTIDEPRESSANT). Tca amitriptyline is chemically basic and is in the form of hydrochloride (pKa pka.9) 4 in the. market Insomnia: Owing to the development of tolerance and the potential for adverse effects such as constipation, its use in the elderly for this indication is recommended against. 2  Urinary incontinence. 3  An accepted use for amitriptyline in Australia is the treatment of urinary urge incontinence.