何谓off-ladder。
①在STR分型图谱中,常会遇到部分样本的少量片段峰未被程序化数字命名,在分型图谱中被标识为off-ladder ②漂移作用和新等位基因都可标识为off-ladder
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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