According to the authors, "Specific cDNAs for chicken Wnt-9a (bp 231800;
GenBank no. AF031168) and chicken Frzb (bp 423918; GenBank no. AF218057) were isolated by RT-PCR from HH stage 16 AV canals and cloned into pSTBlue-1
(Novagen). Whole-mount in situ hybridization protocols and Digoxigenin (DIG)-labeled riboprobe synthesis for
chicken Wnt-9a and Frzb probes were as described (Nieto et al., 1996)." The sequence below was obtained from NCBI (AF031168) using the information provided.