Investigations into the principles underlying the automatic reading of tissue typing plates by double fluorochromasia*

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Abstract
The potential advantages of automated microscopy for reading tissue typing results are accuracy and speed. A technique which depends on fluorescence emission of both Carboxy fluorescein (CF) in live cells and Propidium Iodine (PI) in dead cells has been developed. Factors which influence the data have been investigated and appropriate mathematical corrections proposed. A practical guide is given in an appendix. In comparison with other methods double fluorescence was shown to be more accurate than single fluorescence when compared with results obtained by visual reading.