AN assumption inherent in back-mutation experiments is that at the cell concentrations used ‘background’ prototrophs in a substantially auxotrophic population will be expressed quantitatively in the ...

Clonal growth experiments with polystyrene-attached HeLa cells indicate that analysis of clone size distribution in mammalian cells grown in vitro must be carried out within one plating experiment.

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The plating experiment in this image shows how yeast strains vary in resistance to a drug. Different strains (horizontal rows) were grown at cell densities that decrease from left to right. Sensitive ...