| aa2codon | amino acids to codons | 
| check_cds | Quality control of CDS | 
| codon_diff | Differential codon usage analysis | 
| codon_optimize | Optimize codons | 
| count_codons | Count occurrences of different codons | 
| create_codon_table | create custom codon table from a data frame | 
| est_csc | Estimate Codon Stabilization Coefficient | 
| est_optimal_codons | Estimate optimal codons | 
| est_rscu | Estimate RSCU | 
| est_trna_weight | Estimate tRNA weight w | 
| get_cai | Calculate CAI | 
| get_codon_table | get codon table by NCBI gene code ID | 
| get_cscg | Mean Codon Stabilization Coefficients | 
| get_enc | Calculate ENC | 
| get_fop | Fraction of optimal codons (Fop) | 
| get_gc | GC contents | 
| get_gc3s | GC contents at synonymous 3rd codon positions | 
| get_gc4d | GC contents at 4-fold degenerate sites | 
| get_tai | Calculate TAI | 
| human_mt | human mitochondrial CDS sequences | 
| plot_ca_pairing | Plot codon-anticodon pairing relationship | 
| rev_comp | Reverse complement | 
| seq_to_codons | Convert CDS to codons | 
| show_codon_tables | show available codon tables | 
| yeast_cds | yeast CDS sequences | 
| yeast_exp | yeast mRNA expression levels | 
| yeast_half_life | Half life of yeast mRNAs | 
| yeast_trna | yeast tRNA sequences | 
| yeast_trna_gcn | yeast tRNA gene copy numbers (GCN) |