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We describe pseudo-peptides obtained by the copolymerisation of l-lysine and l-lysine ethyl-ester with various hydrophobic dicarboxylic acid moieties. In aqueous solution, when the carboxylic acid groups are charged, the polymers dissolve. When they are fully neutralised the hydrophobic moieties cause the polymer to precipitate. The pH range over which reversible precipitation occurs can be adjusted...
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