A180850 Number of codons that code for an amino acid, listed in alphabetical order of their single-letter codes.

4, 0, 2, 2, 2, 2, 4, 2, 3, 0, 2, 6, 1, 2, 0, 4, 2, 6, 6, 4, 0, 4, 1, 0, 2, 0

Offset

1,1

Comments

Note that Sum_{n=1..26} a(n) = 61 is the number of codons that are not ending signals (UAA, UAG and UGA). - Jianing Song, Apr 06 2019

References

Francis Crick, "Chapter 8: The genetic code". What mad pursuit: a personal view of scientific discovery. New York: Basic Books, 1988, pp. 89-101. ISBN 0-465-09138-5.

Ricki Lewis, Human Genetics: Concepts and Applications (6th ed.). Boston, Mass: McGraw Hill, 2005, pp. 227-228. ISBN 0-07-111156-5.

Pamela K. Mulligan, Robert C. King, and William D. Stansfield, A dictionary of genetics. Oxford [Oxfordshire]: Oxford University Press, 2006, pp. 608. ISBN 0-19-530761-5.

Links

Table of n, a(n) for n=1..26.

Wikipedia, Genetic code.

Example

a(1)  = No. of codons coding for amino acid A (Ala): GCU, GCC, GCA, GCG.
a(2)  = No. of codons coding for amino acid B (no such amino acid exists).
a(3)  = No. of codons coding for amino acid C (Cys): UGU, UGC.
a(4)  = No. of codons coding for amino acid D (Asp): GAU, GAC.
a(5)  = No. of codons coding for amino acid E (Glu): GAA, GAG.
a(6)  = No. of codons coding for amino acid F (Phe): UUU, UUC.
a(7)  = No. of codons coding for amino acid G (Gly): GGU, GGC, GGA, GGG.
a(8)  = No. of codons coding for amino acid H (His): CAU, CAC.
a(9)  = No. of codons coding for amino acid I (Ile): AUU, AUC, AUA.
a(10) = No. of codons coding for amino acid J (does not exist).
a(11) = No. of codons coding for amino acid K (Lys): AAA, AAG.
a(12) = No. of codons coding for amino acid L (Leu): UUA, UUG, CUU, CUC, CUA, CUG.
a(13) = No. of codons coding for amino acid M (Met): AUG.
a(14) = No. of codons coding for amino acid N (Asn): AAU, AAC.
a(15) = No. of codons coding for amino acid O (does not exist).
a(16) = No. of codons coding for amino acid P (Pro): CCU, CCC, CCA, CCG.
a(17) = No. of codons coding for amino acid Q (Gln): CAA, CAG.
a(18) = No. of codons coding for amino acid R (Arg): CGU, CGC, CGA, CGG, AGA, AGG.
a(19) = No. of codons coding for amino acid S (Ser): UCU, UCC, UCA, UCG, AGU, AGC.
a(20) = No. of codons coding for amino acid T (Thr): ACU, ACC, ACA, ACG.
a(21) = No. of codons coding for amino acid U (does not exist).
a(22) = No. of codons coding for amino acid V (Val): GUU, GUC, GUA, GUG.
a(23) = No. of codons coding for amino acid W (Trp): UGG.
a(24) = No. of codons coding for amino acid X (does not exist).
a(25) = No. of codons coding for amino acid Y (Tyr): UAU, UAC.
a(26) = No. of codons coding for amino acid Z (does not exist).

Crossrefs

Cf. A104155, A135024.

Sequence in context: A386980 A320479 A218769 * A109157 A226955 A123314

Adjacent sequences: A180847 A180848 A180849 * A180851 A180852 A180853

Keyword

nonn,word,fini,full

Author

Muskan Kukreja (mkukreja(AT)asu.edu), Sep 20 2010

Status

approved