Horse genomic DNA was obtained from Zyagen (San Diego, USA). Equine chemokine receptors CXCRA, CXCR2, CCR2, CCR5, C5aR1, and the predicted Duffy antigen receptor (DARC) were amplified from equine genomic DNA by PCR using PfuTurbo DNA polymerase (Stratagene). Primers and accession numbers are listed in Supplementary Table 6. Exons encoding DARC were assembled using overlap extension PCR. All coding sequences were cloned into the pIRESpuro3 vector (Clontech) according to methods described elsewhere12 (link). The human Ga16 cDNA (pCISG16 plasmid) was kindly provided by Melvin I. Simon47 (link). The Ga16 gene was recloned in between the BstBI and EcoRV sites of the pIREShyg3 vector (Clontech) using the following primers:
5′-AACTATTTCGAAGCCGCCACCATGGCCCGCTCGCTGACCTG-3′ and
5′-ATCGAGGATATCTCACAGCAGGTTGATCTCGTC-3′.
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