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(a) A single chip of Si scaffold which consists of ten areas including one flat area and nine patterned areas; (b) Every two areas are insulated by a fence of which width is 4 μm and height is the same as that of pillar (3 μm). Pillar array motif size = pillar width (W) = pillar length (L) = spacing (S) between two pillars; (c) SEM angular views of each area.
