The evolutionary history of Obp using the Neighbour-Joining method. Novel sequences of Myodes glareolus are marked with * and described as myo Obp1-3. Mouse Obp sequences are depicted as mus O1-O8 assigned with respective synonyms Obp1a and Obp1b. Known lipocalin sequences from Cricetus cricetus are Aphrodisin (cri Aphr), Male salivary protein (cri Msp), Female lacrimal protein (cri Flp) and Probasin (cri Prb). In Rattus norvegicus the only two lipocalins belonging to this cluster are Obp1f (rat Obp1f) and Probasin (rat Prb). The optimal tree with the sum of branch length = 11.92163796 is shown. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) are shown next to the branches. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. The evolutionary distances were computed using the Maximum Composite Likelihood method and are in the units of the number of base substitutions per site. All positions containing gaps and missing data were eliminated from the dataset (Complete deletion option). There were a total of 478 positions in the final dataset. Phylogenetic analyses and this caption were conducted in MEGA4 software .