DNA base call identification is based on the nomenclature system
issued by the International Union of Pure and Applied Chemistry
(IUPAC). At positions of ambiguity, the following IUPAC codes are
used:
| G/T = K |
C/T = Y |
A/C/G = V |
| A/G = R |
A/C = M |
C/T/G/ = B |
| G/C = S |
A/G/T = D |
A/C/G/T = N |
| A/T = W |
A/C/T = H |