Vital Staining with Neutral Red and Trypan Blue of3H-Thymidine-Labeled Cells Prior to Autoradiography

Abstract

Mouse cells cultivated in vitro were continuously labeled with tritlated thymidine for 48 hr. In representative groups of labeled cells, the percentages of dead cells were obtained by vital staining with either neutral red or trypan blue. After fixation and autoradiography, the fraction of nonlabeled cells was determined in the same group of cells which had been used for interpretation of viability. Neither neutral red nor trypan blue used prior to autoradiography caused spurious grain formation in the emulsion.