In connection with these cases, the pathogenic character as well as histogenesis and causes of this tumor were analyzed and discussed.
结合病例，对神经母细胞瘤的病理特征、组织发生及其病因，进行了分析讨论。
The enterotoxin gene and fimbrial gene are major reason for the pathogenic character of ETEC. The new method is found in preventing from diarrhea, which is enterotoxin genetic engineering vaccine.
ETEC的肠毒素基因和菌毛蛋白基因对于ETEC的致病性起主要作用，肠毒素基因工程疫苗为预防ETEC引起的腹泻开辟了新的途径。
Malassezia is a kind of yeast fungus with lipophilic character, and also a kind of conditional pathogenic bacteria.
马拉色菌是一种嗜脂的酵母菌，亦是一种条件性致病菌。
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