"structural motif" . "Structural motif" . . "binding motif" . "Structural motif" . "structural motifs" . "motifs" . "milieu" . "box motifs" . "motif" . "B-a-B" . "Motifs" . . "amino acid motif" . . "cleft" . "protein motif" . "supersecondary" . "structural" . "protein structural motif" . .