Figure 1
From: Characterization of the radioresponse of human apical papilla-derived cells
Macroscopic appearance of human apical papilla tissues and characteristics of papillary sphere-forming cells (PSFCs). (a) Photographs of human apical papilla tissues attaching to the teeth. (a, b) Human tooth with mature apex. Arrowhead indicates mature root apex. (c, d) Human tooth with immature apex. Arrow indicates apical papilla tissue not framed in by dentin. Arrowhead indicates formation of the root with immature apex. (b) Morphology of cultured apical papilla-derived cells (APDCs) in vitro. (a) Exponentially growing APDCs under monolayer culture. (b) Papillary sphere-forming cells (PSFCs).