Diversity of features between five different RBDs. (A) sample of 7S RBDs (d1914a1), (B) sample of rRNA RBDs (d2v3ka1), (C) sample of double_stranded RBPs (d1ekza_), (D) sample of mRNA RBDs (d1afwa1), and (E) sample of tRNA RBDs (d1a6fa_). The gray region represents the main patch, blue represents Arg amino acids, and green represents Lys amino acids.