Creation date: Thu Oct 4 18:26:35 2018.

See header of Alphabet.

Nucleotide IUPAC code. See also https://www.bioinformatics.org/sms/iupac.html or https://en.wikipedia.org/wiki/International_Union_of_Pure_and_Applied_Chemistry.

Remarks:

• Question marks (?) are interpreted as unknowns (same as N). However, when a sequence is printed/exported, Ns will be used.
• Full stops (.) are interpreted as gaps (same as -). However, when a sequence is printed/exported, -s will be used

Symbol  Description  Bases represented  Complement
------  -----------  -----------------  ----------
A       Adenine      A                  T
C       Cytosine        C               G
G       Guanine            G            C
T       Thymine               T         A
------  -----------  -----------------  ----------
U       Uracil                U         A
W       Weak         A        T         W
S       Strong          C  G            S
M       aMino        A  C               K
K       Keto               G  T         M
R       puRine       A     G            Y
Y       pYrimidine      C     T         R
B       not A           C  G  T         V
D       not C        A     G  T         H
H       not G        A  C     T         D
V       not T        A  C  G            B
------  -----------  -----------------  ----------
N       any          A  C  G  T         N           (preferred)
?       any          A  C  G  T         N
------  -----------  -----------------  ----------
-       Gap (Zero)                      -           (preferred)
.       Gap (Zero)                      -