According to the authors, "RT-PCR was used to amplify cDNA fragments of ... 450 bp for ... Grg5/AES from HH stage 12 quail embryo mRNA. Primers used are the following: Grg5/AES forward 5′-GCGACAAACTAGCCAGCGAG-3′, reverse 5′-CTGATGTCTCCCCATCGTCGTC-3′. Sequences were submitted to GenBank with the following accession number: AY834285. Sequence shown is quail. Link is the best fit chicken gene.
Insufficient information provided in publication to verify exact sequence used to synthesize probe. Sequence below was obtained from NCBI (XM_015299736.2). Grg5 gene name has been replaced by AES in NCBI.