以下为句子列表：
英文: The ultrastructure of APUD cells in embryos and foetuses was discribed in detail and the relationship between they and tumors was also investigated, which gave mnor phological basis for differentiation and diagnosis of the clinical APUDoma.
中文: 并从超微结构的角度对胚胎期各种APUD细胞做了详细的描述，分析和探讨了它与肿瘤的关系，为临床APUD瘤的鉴别与诊断提供了形态学依据。
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