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Ratio of individual maltose tips to clustered maltose tips among a 5 × 5 microneedles array.
| Spacing between two SU-8 microtubes | |||||
|---|---|---|---|---|---|
| 300 μm | 600 μm | 900 μm | 1200 μm | ||
| Height of microtube | 150 μm | 0/25 | 5/20 | 15/10 | 25/0 |
| 250 μm | 0/25 | 13/12 | 21/4 | 25/0 | |
| 350 μm | 0/25 | 17/8 | 25/0 | 25/0 | |
