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Allele frequency is simply the frequency at which a specific allele is found in members of a population. Let's take the following example from the site you referenced: The first column merely has the name of the allele, A*01. The second column is the population from which individuals were genotyped. Skipping ahead, the fifth column is the number of people ...


N is the IUPAC code for any nucleotide, so in DNA sequence an N signifies any one of the four bases could be in that position. The {4} means 4 of the previous character in the pattern, or NNNN. In Perl regular expressions \d{4} means match 4 digits in a row, so the notation is quite similar.

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