Figure 2: Immunohistochemistry images comparing herniated, degenerated, and non-degenerated (control) discs.
From: Physical disruption of intervertebral disc promotes cell clustering and a degenerative phenotype

Five-micrometre-thin sections stained with H&E to show cell clusters in three conditions (a–c). Red-staining antibodies refer to: MMP-1 (d–f); MMP-3 (h–j); Caspase-3 (k–m). Scale bar = 50 µm.