Fig. 3: Enzymatically and reductively degradable SS-PEA polymer for cell culture and intracellular drug delivery (reprinted from ref. 42 with permission from American Chemical Society).

The figure illustrates the structure and function of a disulfide-containing poly(ester amide) (SS-PEA) polymer designed for responsive drug delivery and cell culture applications. The polymer backbone contains disulfide bonds, enabling degradation under reductive intracellular conditions, while ester and amide bonds allow for degradation.