exonn.¹

/ˈɛksɒn/

Etymology: apparently intended to express the pronunciation /ɛɡzɑ̃/ of French exempt. Compare exaun adj., occurring as a spelling of exempt in 1678; also exant (quot. 1655 below), used in the sense of exempt n. 4a. The ‘exempts’ or ‘exons’ of the Yeomen of the Guard, according to Thoms Bk. of the Court, were first appointed in 1668.

The ordinary title of the four officers of the Yeomen of the Royal Guard, ‘styled corporals in their commissions’ (Thoms) and ranking below the ‘Ensign’; = exempt n. 4b.

ΘΚΠ

society > armed hostility > warrior > soldier > leader or commander > officer by rank > [noun] > officer of other specific ranks

warden1297

constablec1300

sergeant of a band1548

gill-master1598

vinton1610

subcommander1612

exempt1700

exon1767

serrefiles1897

Queen A.T.1943

1655 in E. Nicholas Nicholas Papers (1892) II. 354 The Court gaue Moreland (Cromwells express) two Exants of y^e guards to conduct him in safety.]

1767 Royal Cal. 83 Yeomen of the Guards..Exons [4 names follow].

1843 T. B. Macaulay Madame D'Arblay in Ess. It never occurred..to the Exons, and Keepers of the Robes, that, etc.

1873 Daily News 19 June 6/5 Colonel Bourke (the Exon in Waiting).

1891 New Army List 132 Yeomen of the Guard..Exons [4 names].

This entry has not yet been fully updated (first published 1894; most recently modified version published online March 2018).

exonn.²

Brit.

/ˈɛksɒn/, U.S.

/ˈɛkˌsɑn/

Etymology: < ex- (in expressed adj.¹) + -on suffix¹.

Genetics.

A section of a DNA or RNA molecule that codes for a protein, in cases where such sections are separated by non-coding ones. Cf. intron n.

ΚΠ

1978 W. Gilbert in Nature 9 Feb. 501/1 The notion of the cistron..must be replaced by that of a transcription unit containing regions which will be lost from the mature messenger—which I suggest we call introns (for intragenic regions)—alternating with regions which will be expressed— exons.

1982 P. N. Gray in T. M. Devlin Textbk. Biochem. xviii. 909 The introns are removed by endonucleolytic enzymes, and the exons are joined or spliced together forming a continuous informational sequence.

1983 Nature 21 July 215/3 The residues forming the active site are encoded in three different exons, similar to other serine proteases.

1985 Sci. Amer. Oct. 57/1 (caption) In eukaryotes the protein-coding sequences of DNA (exons) are often separated by intervening sequences (introns) that must be excised from a primary transcript to make messenger RNA (mRNA).

Derivatives

eˈxonic adj.

ΚΠ

1978 Nature 9 Feb. 501/3 Middle repetitious sequences within introns may create hot spots for recombination to rearrange the exonic sequences.

1979 Nature 6 Dec. 571 (caption) The length of the exonic sequence 4″ is 119 ± 29 base pairs.

1981 Sci. Amer. May 55/1 Protein-coding exonic sequences evolve slowly, mainly by point mutations in which one base replaces another, whereas such noncoding sequences as introns evolve much faster by insertion and deletion events of variable extent.

This entry has not yet been fully updated (first published 1989; most recently modified version published online March 2022).

单词	exon
释义	exonn.¹ /ˈɛksɒn/ Etymology: apparently intended to express the pronunciation /ɛɡzɑ̃/ of French exempt. Compare exaun adj., occurring as a spelling of exempt in 1678; also exant (quot. 1655 below), used in the sense of exempt n. 4a. The ‘exempts’ or ‘exons’ of the Yeomen of the Guard, according to Thoms Bk. of the Court, were first appointed in 1668. The ordinary title of the four officers of the Yeomen of the Royal Guard, ‘styled corporals in their commissions’ (Thoms) and ranking below the ‘Ensign’; = exempt n. 4b. ΘΚΠ society > armed hostility > warrior > soldier > leader or commander > officer by rank > [noun] > officer of other specific ranks warden1297 constablec1300 sergeant of a band1548 gill-master1598 vinton1610 subcommander1612 exempt1700 exon1767 serrefiles1897 Queen A.T.1943 1655 in E. Nicholas Nicholas Papers (1892) II. 354 The Court gaue Moreland (Cromwells express) two Exants of y^e guards to conduct him in safety.] 1767 Royal Cal. 83 Yeomen of the Guards..Exons [4 names follow]. 1843 T. B. Macaulay Madame D'Arblay in Ess. It never occurred..to the Exons, and Keepers of the Robes, that, etc. 1873 Daily News 19 June 6/5 Colonel Bourke (the Exon in Waiting). 1891 New Army List 132 Yeomen of the Guard..Exons [4 names]. This entry has not yet been fully updated (first published 1894; most recently modified version published online March 2018). exonn.² Brit. /ˈɛksɒn/, U.S. /ˈɛkˌsɑn/ Etymology: < ex- (in expressed adj.¹) + -on suffix¹. Genetics. A section of a DNA or RNA molecule that codes for a protein, in cases where such sections are separated by non-coding ones. Cf. intron n. ΚΠ 1978 W. Gilbert in Nature 9 Feb. 501/1 The notion of the cistron..must be replaced by that of a transcription unit containing regions which will be lost from the mature messenger—which I suggest we call introns (for intragenic regions)—alternating with regions which will be expressed— exons. 1982 P. N. Gray in T. M. Devlin Textbk. Biochem. xviii. 909 The introns are removed by endonucleolytic enzymes, and the exons are joined or spliced together forming a continuous informational sequence. 1983 Nature 21 July 215/3 The residues forming the active site are encoded in three different exons, similar to other serine proteases. 1985 Sci. Amer. Oct. 57/1 (caption) In eukaryotes the protein-coding sequences of DNA (exons) are often separated by intervening sequences (introns) that must be excised from a primary transcript to make messenger RNA (mRNA). Derivatives eˈxonic adj. ΚΠ 1978 Nature 9 Feb. 501/3 Middle repetitious sequences within introns may create hot spots for recombination to rearrange the exonic sequences. 1979 Nature 6 Dec. 571 (caption) The length of the exonic sequence 4″ is 119 ± 29 base pairs. 1981 Sci. Amer. May 55/1 Protein-coding exonic sequences evolve slowly, mainly by point mutations in which one base replaces another, whereas such noncoding sequences as introns evolve much faster by insertion and deletion events of variable extent. This entry has not yet been fully updated (first published 1989; most recently modified version published online March 2022). < n.¹1767n.²1978
随便看	to etc circles around to etc circles round to etc clock to etc commons to fall in step to fall in the lot of to fall in the lot of a person to fall in two to fall in with to fall into to fall into a booby trap to fall into a misfortune to fall into a passion to fall into a person's eye to fall into bits to fall into chime with to fall into contempt to fall into dust to fall into etc to fall into fear to fall into hazard to fall into line to fall into mould to fall into oblivion to fall into place

exonn.1

exonn.2

Derivatives

exonn.¹

exonn.²