Four short nucleotide sequences within introns serve as signals that indicate to the spliceosome where to cut [ see box on opposite page ] 在插入子的序列上，有四个简短的核苷酸序列，标示了剪接体下刀的位置（参见本页左方细胞的剪接机器） 。
In short , the entry of introns into eukaryotes may have initiated an explosive new round of molecular evolution , based on rna rather than protein 简单的说，插入子进入真核生物后，可能启动了新一回合爆炸般的演化，这次的主角是rna ，而非蛋白质。
Like eukaryotes , but unlike bacteria , they have introns in their transfer rna , but like bacteria they have polycistronic operons ( gene regulators ) 像真核生物而不像细菌，转运rna中含有内含子，还有细菌不具备的多顺反子的操纵子（基因的调控子） 。
Of course , as long as introns needed to splice themselves in and out of genomes , their sequences could not have deviated much from that of group ii introns 当然，只要插入子得靠自己剪接进入或移出基因组，它们的序列就不能与第二类插入子相差太多。
4 , an intron sequence was also inserted upstream of gfpmut3 and its six reading frame could all be stopped , which could guarantee gfp translation in right reading frame 将蓝色荧光蛋白基因bfp克隆到pet - 11c上，转化bl21 ( de3 )后实现了bfp在大肠杆菌中的诱导表达。
Additionally , based on the sequence of intron i of alpha - amylase , a preliminary molecular systematics study has been performed on bombyx mori and bombyx mandarina . 1 本文对野桑蚕-淀粉酶基因进行全序列测定与分析，并作了基于intron的家蚕和野桑蚕分子系统学初步研究。
Based on the study of genetic operations and their parameters , this paper also provides methods to develop the positive role and discard the negative one of introns 文中通过对有关遗传操作方法和参数的研究，定性地分析了它们对基因内区的影响，并指出抑制基因内区消极作用的途径。
Introns were rationalized as ancient remnants of a time before cellular life evolved , when fragments of protein - coding information crudely assembled into the first genes 插入子被解释为：在细胞生物尚未演化形成之前，含有蛋白质编码资讯的片段粗略地组合成第一个基因时所留下的古老遗物。
Although introns constitute 95 percent or more of the average protein - coding gene in humans , most molecular biologists have considered them to be evolutionary leftovers , or junk 其实在人类的蛋白质基因中，平均95 %以上的序列是插入子，大多数的分子生物学家认为它们是演化的残馀物或是垃圾。
One of them was forecasted to produce transcript factor binding site in intron 6 of silky tyrp1 . gel - shift result of this mutation proved that there is transcript factor binding site around the mutated site 经过预测，发现其中的一个snp可能使丝羽乌骨鸡的内含子6中出现了新的转录因子的结合位点。
