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6. Returns - still worried that even after all of the above your Dna Sequence wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Dna Sequence then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Dna Sequence site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Dna Sequence, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Dna Sequence, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.

A DNA sequence or genetic sequence is a succession of letters representing the primary structure of a real or hypothetical DNA molecule or strand, with the capacity to carry information.

The possible letters are A, C, G, and T, representing the four nucleotide subunits of a DNA strand - adenine, cytosine, guanine, thymine bases covalently linked to phospho-backbone. In the typical case, the sequences are printed abutting one another without gaps, as in the sequence AAAGTCTGAC, going from 5' to 3' from left to right. A succession of any number of nucleotides greater than four is liable to be called a sequence. With regard to its biological function, which may depend on context, a sequence may be sense or anti-sense, and either genetic code or noncoding DNA. DNA sequences can also contain "junk DNA."

Sequences can be derived from the biological raw material through a process called DNA sequencing.

In some special cases, letters besides A, T, C, and G are present in a sequence. These letters represent ambiguity. Of all the molecules sampled, there is more than one kind of nucleotide at that position. The rules of the International Union of Pure and Applied Chemistry (IUPAC) are as follows:

A = adenine C = cytosine G = guanine T = thymine R = G A (purine) Y = T C (pyrimidine) K = G T (keto) M = A C (amino) S = G C (strong bonds) W = A T (weak bonds) B = G T C (all but A) D = G A T (all but C) H = A C T (all but G) V = G C A (all but T) N = A G C T (any)

See also

• DNA
• DNA motif
• Single nucleotide polymorphism

A DNA sequence or genetic sequence is a succession of letters representing the primary structure of a real or hypothetical DNA molecule or strand, with the capacity to carry information.

The possible letters are A, C, G, and T, representing the four nucleotide subunits of a DNA strand - adenine, cytosine, guanine, thymine bases covalently linked to phospho-backbone. In the typical case, the sequences are printed abutting one another without gaps, as in the sequence AAAGTCTGAC, going from 5' to 3' from left to right. A succession of any number of nucleotides greater than four is liable to be called a sequence. With regard to its biological function, which may depend on context, a sequence may be sense or anti-sense, and either genetic code or noncoding DNA. DNA sequences can also contain "junk DNA."

Sequences can be derived from the biological raw material through a process called DNA sequencing.

In some special cases, letters besides A, T, C, and G are present in a sequence. These letters represent ambiguity. Of all the molecules sampled, there is more than one kind of nucleotide at that position. The rules of the International Union of Pure and Applied Chemistry (IUPAC) are as follows:

A = adenine C = cytosine G = guanine T = thymine R = G A (purine) Y = T C (pyrimidine) K = G T (keto) M = A C (amino) S = G C (strong bonds) W = A T (weak bonds) B = G T C (all but A) D = G A T (all but C) H = A C T (all but G) V = G C A (all but T) N = A G C T (any)

See also

• DNA
• DNA motif
• Single nucleotide polymorphism

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