In biology, a<unk> is a genetic variant, a subtype or a culture within a biological species.<unk>  are often seen as inherently artificial concepts, characterized by a specific intent for genetic isolation. This is most easily observed in microbiology where<unk>  are derived from a single cell colony and are typically quarantined by the physical constraints of a Petri dish.<unk>  are also commonly referred to within virology, botany, and with rodents used in experimental studies.
Strain 
Serotype
Course 
Isotype 
Killing Season
Dose 
Regimen
Uniject