Quartet puzzling consensus maximum likelihood phylogenetic tree of Orc1 and Cdc6 protein sequences from representative eukaryotes and Orc/Cdc6 protein sequences from published haloarchaeal genome sequences. Protein sequences from Halobacterium sp. NRC-1 are denoted as their published protein names. Sequences from H. marismortui (H.ma), N. pharaonis (N. ph), Saccharomyces cerevisiae (S.ce), Drosophila melanogaster (D.me), and Arabidopsis thaliana (A.th) use three letter designations and published protein names. Homo sapiens sequences are denoted as Human along with their published protein names.