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Christian, Jan L.; Gavin, Brian J.; McMahon, Andrew P.; Moon, Randall T. "Isolation of cDNAs partially encoding four XenopusWnt-1int-1-related proteins and characterization of their transient expression during embryonic development". Developmental Biology. 143 (2). 1991-02-01: 230–234. doi:10.1016/0012-1606(91)90073-C. ISSN0012-1606.