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Characteristics of GHS. (a) Platform diagram of endothelial cell attached in BM and GHS design inspired by nanohole structure of BM. Dashed white circles indicate the nanohole structure of BM. (b) Illustration of GHS. Diameter range (w) of GHS are 120–200 nm, 200–280 nm, and 280–360 nm, respectively. The depths (d) and intervals (i) of all GHS are consistent of 440 nm. (c) Representative SEM images of HP1, HP2, and HP3 GHS. Scale bars are 200 nm.
