stock strain

stock strain

a bacterial or other microbial strain that has been maintained under laboratory conditions as representative of its type.
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CDC also identified a chloramphenicol resistance gene (a common, laboratory-based resistance marker) that was not in the original laboratory stock strain, suggesting that the infecting strain had been modified as part of routine laboratory research.
dysenteriae type 2 matching the laboratory's stock strain by pulsed-field gel electrophoresis was recovered from ill laboratory workers and from an uneaten pastry.
Breeders use grandparent pure-line stock strains to produce parent stock strains of chickens, which in turn supply eggs to hatcheries.