Conserved OR-specific motifs used to identify OR genes in the cattle genome, and the frequency of sequences with or without these motifs. (A) Amino acid sequences of the OR-specific motifs are shown. The numbers indicate the positions of amino acids. TM, transmembrane domain. (B) Proportional distribution of the 881 functional OR amino acid sequences identified by their OR motif-containing patterns. The motifs within parentheses were absent. GN motifs were observed with or without variations.