SmartDraw includes thousands of professional-looking diagrams like this that you can easily edit and make your own.
Text in this example:
Cysteine
(C) TGT, TGC Aspartic
Acid
(D) GAT, GAC Glutamic
(E) GAA, GAG Alanine
(A) GCT, GCC, GCA, GCG Glycine
(G) GGT, GGC, GGA, GGG Histidine
(H) CAT, CAC Isoleucine
(I) ATT, ATC, ATA Phenylalanine
(F) TTT, TTC Leucine
(L) CTT, CTC, CTA, CTG, TTA, TTG Methionine*
(M) ATG* Asparagine
(N) AAT, AAC Lysine (K) AAA, AAG Glutamine
(Q) CAA, CAG Arginine
(R) CGT, CGC, CGA, CGG, AGA, AGG Serine
(S) TCT, TCC, TCA, TCG, AGT, AGC Proline
(P) CCT, CCC, CCA, CCG Valine
(V) GTT, GTC, GTA, GTG Tryptophan
(W) TGG Tyrosine
(Y) TAT, TAC Threonine
(T) ACT, ACC, ACA, ACG Start Codons ATG* Stop Codons TAA, TAG, TGA The Genetic Code