TY - RPRT TI - Origins of polymorphism at a polypurine hypervariable locus. AU - H M Brereton AU - F A Firgaira AU - D R Turner PY - 1993 DO - 10.1093/nar/21.11.2563 UR - https://pubmed.ncbi.nlm.nih.gov/8332453/ ID - 8332453 ER -