前导区（leader region），是操纵子或单个基因内，从转录起始位点的核苷酸到结构基因起始密码子间的DNA区段。
在快攻中，快速地追随比赛，以他对有球区的责任，辅助新的前导裁判。
On fast break passes, following the play quickly to assist the new LEAD with his responsibility for ball coverage.
经d NA序列分析表明所获基因含有全部前导序列，其成熟蛋白编码部分与从第一骨架区引物所克隆的序列相符。
DNA sequences analysis indicated that the cloned genes included the whole leader sequences and the mature Ig protein encoding regions.
这个质子活动区的主要形态特点是前导大黑子A的半影纤维的顺时针旋涡结构。
The main morphological feature of this proton active region is the clockwise spiral structure of the penumbral filaments of the large preceding spot "A".
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