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Biosafety of PDA-HP hydrogel. (A–E) HE staining of major organs—heart (A), liver (B), spleen (C), lungs (D), and kidneys (E)—in SCI mice treated with PBS or PDA-HP/NIR for 4 weeks. Scale bars are 100 μm and 50 μm, respectively. (F) Live/dead staining of ND7/23 cells in the CON and PDA-HP/NIR groups, the number of live cells (mean ± SD, n = 6, nsp = 0.335), and the percentage of live cells (mean ± SD, n = 6, nsp = 0.303). Scale bars are 100 μm.
