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
#> "#1f77b4" "#ff7f0e" "#2ca02c" "#d62728" "#9467bd" "#8c564b" "#e377c2" "#7f7f7f"
#> His Ile Leu Lys Met Phe Pro Ser
#> "#bcbd22" "#17becf" "#aec7e8" "#ffbb78" "#98df8a" "#ff9896" "#c5b0d5" "#c49c94"
#> Thr Trp Tyr Val fMet Ile2 SeC
#> "#f7b6d2" "#c7c7c7" "#dbdb8d" "#9edae5" "#393b79" "#5254a3" "#6b6ecf"