Second position
       |      T       |      C       |      A       |      G       |
   ----+--------------+--------------+--------------+--------------+----
       | TTT  Phe (F) | TCT  Ser (S) | TAT  Tyr (Y) | TGT  Cys (C) | T
     T | TTC   "      | TCC   "      | TAC          | TGC          | C
  F    | TTA  Leu (L) | TCA   "      | TAA  Ter     | TGA  Ter     | A  T
  i    | TTG   "      | TCG   "      | TAG  Ter     | TGG  Trp (W) | G  h
  r  --+--------------+--------------+--------------+--------------+--  i
  s    | CTT  Leu (L) | CCT  Pro (P) | CAT  His (H) | CGT  Arg (R) | T  r
  t  C | CTC   "      | CCC   "      | CAC   "      | CGC   "      | C  d
       | CTA   "      | CCA   "      | CAA  Gln (Q) | CGA   "      | A
  P    | CTG   "      | CCG   "      | CAG   "      | CGG   "      | G  P
  o  --+--------------+--------------+--------------+--------------+--  o
  s    | ATT  Ile (I) | ACT  Thr (T) | AAT  Asn (N) | AGT  Ser (S) | T  s
  i  A | ATC   "      | ACC   "      | AAC   "      | AGC   "      | C  i
  t    | ATA   "      | ACA   "      | AAA  Lys (K) | AGA  Arg (R) | A  t
  i    | ATG  Met (M) | ACG   "      | AAG   "      | AGG   "      | G  i
  o  --+--------------+--------------+--------------+--------------+--  o
  n    | GTT  Val (V) | GCT  Ala (A) | GAT  Asp (D) | GGT  Gly (G) | T  n
     G | GTC   "      | GCC   "      | GAC   "      | GGC   "      | C
       | GTA   "      | GCA   "      | GAA  Glu (E) | GGA   "      | A
       | GTG   "      | GCG   "      | GAG   "      | GGG   "      | G
   ----+--------------+--------------+--------------+--------------+----