Exogenous Cu外源Cuexogenousadj.外生的；外界产生的；由外生长的exogenous information外生信息exogenous nucleotides外源核苷酸exogenous cold-evil外寒Exogenously Sunk Cost外生沉淀成本exogenous nueleotides外源核苷酸exogenous money supply货币供给的外生性exogenous disturbances干扰输入exogenous rhinorrhagia外感衄血exogenous type failure外因型失效Exogenous organic acid外源有机酸

1. Activation of an internal gene requires generation of new sequences.
   内源基因的激活需要新序列的产生。
2. Only about one out of a million cells will correctly incorporate a foreign gene using the most common versions of this technique.
   应用这种最常规的技术，仅有百万分之一的细胞可以正确加人外源基因。