Phylogenetic tree of MADS-box proteins from different plants. Phylogenetic tree showing the different clades of MADS-box Type I family proteins. The Type II MADS-box SEPALATA, AGAMOUS and SOC1 families are shown as a condensed branch. The sequences used and their accession numbers are shown in Table 1. Barley HvOS1 and HvOS2 members are in bold. Numbers indicate bootstrap values (1000 = 100%).