SEM images of dextran:LysOMe hydrogels crosslinked at different mass ratios shown at increasing magnifications: (a) 2:1 at 70x, (b) 2:1 at 400x, (c) 2:1 at 1000x, (d) 5:1 at 70x, (e) 5:1 at 400x, (f) 5:1 at 1000x. For comparison a control dextran hydrogel with no amino acid crosslinker at various magnifications, (g) 70x, (h) 400× and (i) 1000x.