A

Fibroblasts predominate in the cell-rich zone of the dental pulp; they form the bulk of the connective-tissue stroma, whereas undifferentiated mesenchymal cells are fewer and odontoblasts/ameloblasts are confined to other layers [Lyn, 1991, PMID 1820812; Álvarez-Vásquez, 2022, PMID 35577145].