TY - JOUR T1 - What is a polymorphism? [letter; comment] JO - Blood UR - http://dx.doi.org/10.1182/blood.v78.1.250.250 PY - 1991/07/01 AU - Peake I AU - Winship P ED - DO - DOI: 10.1182/blood.v78.1.250.250 PB - American Society of Hematology VL - 78 IS - 1 SP - 250 EP - 250 Y2 - 2025/04/04 ER -