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Evolution of HEK arrays. HEKs were seeded on POEGMA patterns generated on APTS-coated glass (APTS), LBL-coated glass with macro-initiator printing (Macro I) and gold (Gold) substrates and incubated for 7 days. For each substrate, the same areas of interest were followed at 0, 1, 3 and 7 days. Scale bar: 100 μm.
