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Amino Acids

Set of amino acid symbols also covers IUPAC amino acid symbols plus a gap symbol:

Symbol	Constant	Meaning
'A'	AA_A	Alanine
'R'	AA_R	Arginine
'N'	AA_N	Asparagine
'D'	AA_D	Aspartic acid (Aspartate)
'C'	AA_C	Cysteine
'Q'	AA_Q	Glutamine
'E'	AA_E	Glutamic acid (Glutamate)
'G'	AA_G	Glycine
'H'	AA_H	Histidine
'I'	AA_I	Isoleucine
'L'	AA_L	Leucine
'K'	AA_K	Lysine
'M'	AA_M	Methionine
'F'	AA_F	Phenylalanine
'P'	AA_P	Proline
'S'	AA_S	Serine
'T'	AA_T	Threonine
'W'	AA_W	Tryptophan
'Y'	AA_Y	Tyrosine
'V'	AA_V	Valine
'O'	AA_O	Pyrrolysine
'U'	AA_U	Selenocysteine
'B'	AA_B	Aspartic acid or Asparagine
'J'	AA_J	Leucine or Isoleucine
'Z'	AA_Z	Glutamine or Glutamic acid
'X'	AA_X	Any amino acid
'*'	AA_Term	Termination codon
'-'	AA_Gap	Gap (none of the above)

http://www.insdc.org/documents/feature_table.html#7.4.3

Symbols are accessible as constants with AA_ prefix:

julia> AA_A
AA_A

julia> AA_Q
AA_Q

julia> AA_Term
AA_Term

julia> typeof(AA_A)
BioSymbols.AminoAcid

Symbols can be constructed by converting regular characters:

julia> convert(AminoAcid, 'A')
AA_A

julia> convert(AminoAcid, 'P') === AA_P
true

julia> convert(AminoAcid, 'a') === convert(AminoAcid, 'A')
true

3-letter and 1-letter abbreviations can be parsed using parse in a case-insensitive way:

julia> parse(AminoAcid, "Pro")  # 3-letter abbreviation
AA_P

julia> parse(AminoAcid, "P")    # 1-letter abbreviation
AA_P

julia> parse(AminoAcid, "Pro") == parse(AminoAcid, "pRo")
true

julia> tryparse(AminoAcid, "Pro")  # tryparse returns a nullable value
Nullable{BioSymbols.AminoAcid}(AA_P)

julia> tryparse(AminoAcid, "Pr")
Nullable{BioSymbols.AminoAcid}()