| 释义 |
noun ˈɛksənˈɛksɑn Biochemistry A segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence. 〔生化〕外显子，编码序列。比较INTRON Compare with intron Example sentencesExamples - The structure of the invertase genes are fairly similar, each containing between six and eight exons.
- All of them contained usually short fragments of coding sequences corresponding to exons of single-copy genes.
- As a result, the protein sequences encoded by these exons are nearly identical between the two species.
- He concluded that recombination had separated the genealogical histories of introns and exons within these genes.
- Sequence data for each gene encompassed all coding exons and the intervening introns.
Derivativesadjective Biochemistry Polymerase chain reaction primer pairs were designed for exons 2-12 outside the exonic borders. Example sentencesExamples - Most of the exonic nucleotide changes are silent third-position changes.
- Homology of the exonic nucleotide sequence with human and murine sequences is high (89% and 85% sequence identity, respectively).
- Amplification of exonic regions facilitated this step, since indel polymorphism within exon regions was observed in only one gene.
- In each case, a highly conserved region was found in the intron downstream of the editing site and this region was shown to be complementary to the region of the exonic editing site.
Origin1970s: from expressed (see express1) + -on. noun ˈɛksɒnˈɛksɑn British Each of the four officers acting as commanders of the Yeomen of the Guard. 〈英〉英王仪仗卫士队长
OriginMid 18th century: representing the pronunciation of French exempt 'free from', from Latin exempt- 'taken out', from the verb eximere, so named because these officers were exempt from normal duties. nounˈeksänˈɛksɑn Biochemistry A segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence. 〔生化〕外显子，编码序列。比较INTRON Compare with intron Example sentencesExamples - He concluded that recombination had separated the genealogical histories of introns and exons within these genes.
- All of them contained usually short fragments of coding sequences corresponding to exons of single-copy genes.
- As a result, the protein sequences encoded by these exons are nearly identical between the two species.
- Sequence data for each gene encompassed all coding exons and the intervening introns.
- The structure of the invertase genes are fairly similar, each containing between six and eight exons.
Origin1970s: from expressed (see express) + -on. nounˈeksänˈɛksɑn British Each of the four officers acting as commanders of the Yeomen of the Guard. 〈英〉英王仪仗卫士队长
OriginMid 18th century: representing the pronunciation of French exempt ‘free from’, from Latin exempt- ‘taken out’, from the verb eximere, so named because these officers were exempt from normal duties. |