Notably and despite the compelling evidence from several studies that the double homozygous A/A-A/A genotype in FKBP6 exon 5 is significantly associated with the occurrence of IAE in TB stallions5,7,8, we did not detect the presence of the FKBP6 protein in sperm from any of the stallion groups tested. The gene discussed is FKBP6; the disease is tuberculosis.