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Sequence alignment of Orc4 proteins. The amino acid sequence of the C-terminal domain of Orp4 protein (sporp4) is aligned with the sequences of the Orc4 proteins of human (hsorc4), frog (xlorc4), and budding yeast (scorc4). Identical amino acids shared by the majority of sequences are shaded black and similar amino acids are shaded gray. The Walker A and B sites are indicated.
