Abstract
To evaluate the effect of extended incubation in phosphate-buffered saline (PBS) on the quality of mouse bone-marrow metaphase preparations, bone-marrow samples were allowed to stand in PBS at room temperature for from 15 min to 3 h before hypotonic treatment and fixation. The frequencies of sister-chromatid exchanges, the rate of cellular proliferation and the mitotic indices in these mice were not significantly affected by prolonged storage in PBS. However, slide quality decreased significantly in bone-marrow samples stored in PBS for more than 2 h. These data demonstrate that the storage of bone-marrow samples in PBS at room temperature for at least 1 h does not adversely affect the quality of routine cytogenetic data, making it more feasible to conduct studies involving large numbers of animals.
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