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鼠的牙式是由每一牙弓象限的3个切牙、1个尖牙、4个前磨牙和3个磨牙组成的。鼠胚的演变导致牙数的减少。在1个切牙与3个磨牙之间出现一条长的缺失带。然而作者等发现,在胚胎期第12.5天至13.5天之间,这一区域中仍有7个剩余的牙齿始基。他们以计算机作为辅助进行三维模型重建来分析R_1、R_2这两个最大、最远中的剩余始基退化过程中的凋亡模型。结果发现:在胚胎的发育过程中,凋亡的细胞和细胞团在R_1的上皮内开始浓缩,到胚胎期第12.5天时,R_1始基
The rat's teeth are composed of 3 incisors, 1 canine, 4 premolar and 3 molar teeth in each arch of the arch. Evolution of the mouse embryo leads to a decrease in the number of teeth. A long missing band appeared between one incisor and three molars. However, the authors found that there are still seven remaining teeth in this area between the 12.5th and 13.5th days of the embryo. Using computer as an aid, they reconstructed 3D models to analyze the apoptotic models of R_1 and R_2, the two largest and farthest remnants of remaining primordium. The results showed that during embryonic development, apoptotic cells and cell clusters began to concentrate in the epithelium of R_1. At embryonic day 12.5,