人类牙齿的发育，经历蕾状期、帽状期、钟状期、牙根发育和牙齿萌出期。
Human tooth development is a reciprocal and consecutive process, which includes bud, cap, bell stages, tooth root development and tooth eruption.
人类牙齿的发育，经历蕾状期、帽状期、钟状期、牙根发育和牙齿萌出期。
Human tooth development is a consecutive process, which includes bud stage, cap stage, bell stage and tooth root development.
人类牙齿发育是一个连续的过程，经历了蕾状期、帽状期、钟状期和牙根发育期。
Human tooth development is a consecutive process, which includes bud stage, cap stage, bell stage and tooth root development.
人类牙齿发育是一个连续的过程，经历了蕾状期、帽状期、钟状期和牙根发育期。
Human tooth development is a reciprocal and consecutive process, which includes bud, cap, bell stages, tooth root development and tooth eruption.
结果：牙胚发育过程中的蕾状期、帽状期、钟状晚期基质金属蛋白酶- 2 （MMP - 2 ）均有表达，但以钟状期前牙本质细胞的表达最明显。
RESULTS: The expression of MMP-2 could be found in bud stage , cap stage and later time of bell stage.
结果：牙胚发育过程中的蕾状期、帽状期、钟状晚期基质金属蛋白酶- 2 （MMP - 2 ）均有表达，但以钟状期前牙本质细胞的表达最明显。
RESULTS: The expression of MMP-2 could be found in bud stage , cap stage and later time of bell stage. A high level of MMP-2 was confined to secretory odontoblas…
结果：牙胚发育过程中的蕾状期、帽状期、钟状晚期基质金属蛋白酶- 2 （MMP - 2 ）均有表达，但以钟状期前牙本质细胞的表达最明显。
RESULTS: The expression of MMP-2 could be found in bud stage , cap stage and later time of bell stage. A high level of MMP-2 was confined to secretory odontoblas…
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