Abstract
Total RNA content in Chinese hamster ovary and HeLa-S3 cells determined by ultraviolet spectroscopy is compared with the red fluorescence distribution of acridine orange-stained cells observed by flow cytometry. A correlation coefficient of 0.93 is obtained when these methods of estimating RNA content are compared after various RNAse treatments. These data suggest that acridine orange staining effectively quantitates total cellular RNA content when analyzed by flow cytometry, although DNA is also shown to contribute a low but significant background of red fluorescence.
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