Fig. 1From: Hypoxia regulates adipose mesenchymal stem cells proliferation, migration, and nucleus pulposus-like differentiation by regulating endoplasmic reticulum stress via the HIF-1α pathwayIdentification of NPCs. A The morphology of NPCs observed under a light microscope; B NPCs observed under fluorescence microscope (red staining for COL-2, blue staining for nuclei); C NPCs observed under fluorescence microscope (red staining for COL-1, blue staining for nuclei)Back to article page