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(a) Schematic representation of the maleimide-VEGF-165 concentration gradient in hydrogels; (b) Schematic of the co-culture system of ECs and RSCs in the VEGF-165 concentration gradient with uniform GRGDS immobilized; (c,d) Close interactions between the ECs and RSCs and the formation of EC tubular-like structures after 14 days in the presence of RSCs. Reproduced with permission from Reference [119].
