Table 1. PCR primer sequences and product length.

Gene	Abbr.	Forward primer	Reverse primer	Size of product
Alpha galactosyltransferase	α-gal	5′-GCTCCACCTGGCAGTCATAG-3′	5′-GTCCTGGAGGATTCCCTTGA-3′	361 bp
Porcine endogenous retrovirus	PERV	5′-CTACCCCGAGATTGAGGAGC-3′	5′-GGGGGATGGTTAGTTTTCCA-3′	317 bp
Swine leukocyte antigen DR alpha	SLA-DRα	5′-CGAGAAGAGGTGGCAAGACA-3′	5′-GTCCTGGAGGATTCCCTTGA-3′	220 bp
Swine leukocyte antigen 2	SLA-2	5′-GTCACCTTGAGGTGCTGGG-3′	5′-TGGCAGGTGTAGCTCTGCTC-3′	185 bp