传代数
chuán dài shù
- passage number
传代数-
男性外显率有逐代降低，患者发病年龄随传代数增加呈现遗传早发现象。
The penetrance and the age of males decreased with the generation .
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移植瘤建成的标准是：传代数应在15-20代（每代传3&4只动物）；
Successful establishment of transplantable tumor models should satisfy the following standards : 15 - 20 successive generations ( at least 3 - 4 animals each generation );