MATLAB: Why nucleotides is more than 4

nucleotides

hi as I know the no. of nucleotides is 4 letters. why in matlab consider it 17 letters as in table here:
thanks

Best Answer

  • The table there looks pretty straight-forward to me: http://www.mathworks.com/help/toolbox/bioinfo/ref/int2nt.html#bp_rekb-1 . It has codes for situations in which particular sets of nucleotides are known to be present or known to be absent.
    Besides, the number of known nucleotides is not 4: it is currently 8. The 7th and 8th were announced in July 2011, with the 5th and 6th having been announced in April 2005.