Precisely how lowered levels of the gene product, an enzyme called hexoseaminidase A, protect against TB isn't known. Balanced polymorphism may explain why cystic fibrosis is so common- the ...

This played a key role in mapping the HD gene (Gusella et al., 1983). Although researchers had discovered that the G8 DNA probe was likely to correspond to a polymorphic chromosomal region located ...

As HIV spreads from individual to individual, genetically diverse viruses confront the most highly polymorphic gene family in humans -- that encoding the human leukocyte antigen (HLA) class I and ...