Examlex
The written Chinese language is about 10,000 years old.
HbS Allele
A variant of the human hemoglobin gene associated with sickle cell disease, resulting from a single nucleotide substitution that alters the hemoglobin's structure.
Selection
In evolutionary biology, a process by which certain traits become more or less common in a population due to the differential reproductive success of organisms with those traits.
Antigenic Drift
Describes natural selection on seasonal influenza viruses that alters the structure of surface proteins, allowing them to evade the antibody-mediated immunity induced during previous infections or vaccinations.
Flu Vaccine
A vaccination that protects against the influenza virus, redeveloped each year to combat the seasonally evolving strains.
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