Human codon usage table
Nature 409, 860 - 921 (15 February 2001)

TTT (171) TCT (147) TAT (124) TGT (99)
TTC (203) TCC (172) TAC (158) TGC (119)
TTA (73) TCA (118) TAA (0) TGA (0)
TTG (125) TCG (45) TAG (0) TGG (122)

CTT (127) CCT (175) CAT (104) CGT (47)
CTC (187) CCC (197) CAC (147) CGC (107)
CTA (69) CCA (170) CAA (121) CGA (63)
CTG (392) CCG (69) CAG (343) CGG (115)

ATT (165) ACT (131) AAT (174) AGT (121)
ATC (218) ACC (192) AAC (199) AGC (191)
ATA (71) ACA (150) AAA (248) AGA (113)
ATG (221) ACG (63) AAG (331) AGG (110)

GTT (111) GCT (185) GAT (230) GGT (112)
GTC (146) GCC (282) GAC (262) GGC (230)
GTA (72) GCA (160) GAA (301) GGA (168)
GTG (288) GCG (74) GAG (404) GGG (160)