Bovine non-classical MHC-I proteins can be either membrane associated or secreted.
BoLA-NC1*00501, -NC3*00101 and -NC4*00201 were membrane associated proteins.
The BoLA-NC1*00401 splice variant was expressed as a secreted protein.
BoLA-NC2*00102 remained intracellular and may require a specific peptide antigen.