CAI	Codon adaptation index
CBI	Codon bias index
CDS	Coding sequences
CUB	Codon usage bias
ENC	Effective number of codons
GRAVY	Grand Average of Hydropathicity
ML	Maximum likelihood
RSCU	Relative synonymous codon usage
SCUB	Synonymous codon usage bias
MP	Medicago polymorpha
MS	Medicago sativa
MT	Medicago truncatula
GC1	GC content at codon positions 1
GC2	GC content at codon positions 2
GC3	GC content at codon positions 3
GC12	Average GC1 and GC2
GCall	Total GC content