Examlex
Antigenic drift differs from antigenic shift in that antigenic drift reflects the exchange of RNA strands between different virus strains within a common host cell,whereas antigenic shift is the gradual mutation over time of the glycoproteins on the viral envelope that bind to immune cells.
Effective Letter
A written communication that clearly conveys its intended message and achieves its purpose with the recipient.
Passive Voice
A grammatical construction in which the noun or noun phrase that would be the object of an active sentence appears as the subject of a sentence with passive voice.
Priority Mail
A postal service level that offers expedited delivery of packages and letters.
Guaranteed Next-day Delivery
A postal or courier service promise ensuring that a package will arrive at its destination within the next day after dispatch.
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