The upstream region is required but not sufficient to control mutually exclusive expression of Paramecium surface antigen genes.


Paramecium tetraurelia stock 51 can express at least 11 different surface antigens, yet only one type is found on the surface of a cell at any given time. The mechanism that controls this mutually exclusive expression is unknown. A previous study has shown that the 51A surface antigen gene is regulated at the level of transcription (Gilley, D., Rudman, B. M… (More)


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