title: Homozygous MM in ankylosing spondylitis.
mesh_terms: D006720:Homozygote; D006801:Humans; D008951:MNSs Blood-Group System / Q000235:genetics*; D013167:Spondylitis, Ankylosing / Q000097:blood*
chemical_list: D008951:MNSs Blood-Group System