| The bodywall muscle in these revertant animals is also indistinguishable from wild-type muscle when viewed under polarized light. |
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| This gives the appearance of directed mutagenesis because only revertant cells survive mutagenesis. |
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| If the same maximum copy number is used, there will also be a distinct effect on the fitness relative to revertant cells. |
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| The patient exhibited a patch of clinically healthy revertant skin on her left forearm. |
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| No concentration-related increase of number of revertant colonies treated with cordycepin was observed. |
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| The number of spontaneously induced revertant colonies per plate is relatively constant. |
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| The revertant bacteria are detected by their ability to grow in the absence of the amino-acid required by the parent test strain. |
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| After the incubation period, the number of revertant colonies per plate is counted. |
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| The number of visible revertant colonies was counted. |
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| The strains should also yield spontaneous revertant colony plate counts within the frequency ranges expected from the laboratory's historical control data and preferably within the range reported in the literature. |
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| Cytotoxicity may be detected by a reduction in the number of revertant colonies, a clearing or diminution of the background lawn, or the degree of survival of treated cultures. |
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| For both techniques, after two or three days of incubation, revertant colonies are counted and compared to the number of spontaneous revertant colonies on solvent control plates. |
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