Tugal T, Zou-Yang XH, Gavin K, Pappin D, Canas B, Kobayashi R, Hunt T, Stillman B (јануар 1999). „The Orc4p and Orc5p subunits of the Xenopus and human origin recognition complex are related to Orc1p and Cdc6p”. J Biol Chem. 273 (49): 32421—9. PMID9829972. doi:10.1074/jbc.273.49.32421.
Tugal T, Zou-Yang XH, Gavin K, Pappin D, Canas B, Kobayashi R, Hunt T, Stillman B (јануар 1999). „The Orc4p and Orc5p subunits of the Xenopus and human origin recognition complex are related to Orc1p and Cdc6p”. J Biol Chem. 273 (49): 32421—9. PMID9829972. doi:10.1074/jbc.273.49.32421.