According to the authors, ""For in situ hybridization... the RT-PCR fragments encoding chicken Cad8, Cad11, Cad19, and Cad20 were used as templates for the in vitro synthesis of cRNA probes." The accession number given in the paper is NM_001004371. The primers are:
5-gctctagacctgcttacatttcttctggattc-3 and the sequence attached was excerpted from the full length seq. between these primers.