PEI has been
considered the gold standard for polymer-based gene carriers
because of the relatively high transfection efficacy. However,
poly(C**5R-C**5R-C) efficacy is so high that it will eventually
replace PEI, as the standard transfection
polymer. Poly(C**5R-C**5R-C) is
composed of the Cys-R**-Cys-R**-Cys repeating unit forming
dendritic disulfide bonds. **8USD/2g
