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Phylogenetic tree of P4 ATPases (lipid flippases). Accession numbers for sequences are given in Table 2. For comparison, the following outliers were included: A bacterial P1A ATPase E. coli KdpB (P03960), the S. cerevisiae pump ScDrs2p (P39524), and the H. sapiens pump HsATPaseII (ATP8A1; Q9Y2Q0).
