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I. Benhar;Q.C. Wang;D. FitzGerald;I. Pastan;. (1994). Pseudomonas exotoxin A mutants. Replacement of surface-exposed residues in domain III with cysteine residues that can be modified with polyethylene glycol in a site-specific manner. . Journal of Biological Chemistry, (), –. doi:10.1016/s0021-9258(17)36846-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research