PCNA and PCD were also observed in ameloblasts and odontoblasts, especially in the stellate reticulum cells of enamel organ and dental papilla during the period of dentin formation.

• 钟状晚期及牙体组织形成后，已分化的外釉上皮细胞、成釉细胞、成牙本质细胞中也可见，但以牙乳头及星网层细胞中多见。