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(A) Non-transfected HeLa cells (○) and transfected HeLa cells expressing lacZ (▴), hygromycin (▵), RTB-H2 (•) or RTB-H12 (grey circles) were treated with ricin, and their ability to synthesize proteins subsequently was determined. (B) Non-transfected HeLa cells (□) and RTB-H2 cells (▪) were treated with recombinant RTA and their ability to synthesize proteins subsequently was determined.
