Multiple-logo visualization of 1425 human and mouse functional OR genes. The sequence logos of the root and each clade (A-S and class I) of 1425 human and mouse functional OR genes. A. The screenshot of Phylo-mLogo result. B. HsOR17.1.14 (as known as OR1E1) was selected as the reference for identifying the TM domains. C. The identified TM1 and TM2 domains and their conservations and variations between different clades.