Return a named character vector of colors for the 20 standard amino acids plus fMet, Ile2, and SeC.
Examples
aa_colors()
#> Ala Arg Asn Asp Cys Gln Glu Gly
#> "#D5F6E2" "#A5C2F6" "#FF9902" "#9A00FF" "#D9B5FF" "#44B3E1" "#D10C0D" "#000000"
#> His Ile Leu Lys Met Phe Pro Ser
#> "#0070C0" "#FFFF00" "#FF00FF" "#FFD9AF" "#ADADAD" "#C99D89" "#12501A" "#FFC000"
#> Thr Trp Tyr Val fMet Ile2 SeC
#> "#002060" "#800000" "#47D359" "#FFCAE2" "#ADADAD" "#FFFF00" "#FFC000"