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Abstract. We describe a double labelling method for estimating the duration of DNA synthesis (Ts) and the flux of cells into and from the S phase of the cell cycle, based on labelling with tritiated thymidine ((3H)TdR) followed by bromodeoxyuridine (BrdU) and combining immunohistological...
Abstract. When the mouse mammary adenocarcinoma 755 (Ca-755) reaches the plateau phase of growth, non-cycling cells with a G2-DNA content can be observed. They may belong to the diploid cell cycle but they could also be blocked in G0 or G1 of a tetraploid cycle. This hypothesis was tested in...
Abstract. In some cases of acute lymphoblastic leukaemia (ALL) the percentage of cells in G2 + M is higher than anticipated when compared with the percentage in S phase. This increase in G2 + M, as detected by flow cytometry measurement of DNA content, may be due to an accumulation of cells,...
Abstract. The c-sis oncogene encoding the B-chain of platelet-derived growth factor (PDGF) may be involved in an autocrine growth stimulation of tumours expressing the PDGF receptor, such as glioblastomas and sarcomas. To investigate whether expression of c-sis RNA is regulated in a cell cycle...
Abstract. In a preceding analysis we hypothesized that the most important parameter controlled by erythropoietic regulation in vivo is the degree of amplification (number of cell divisions) in the CFU-E and erythroblast cell stages. It was concluded that erythropoetic amplification in vivo is...
Abstract. The incidence and morphometric characteristics of individual dead cells have been measured in 51 cases of broncho-pulmonary carcinoid tumours. In both typical and atypical carcinoids, these dead cells were distinguished by nuclei that were significantly smaller and less regular than...
Abstract. Topical application on rat oral mucosa of the chemical 4-nitroquinoline 1-oxide (4NQO) has been shown to produce squamous cell carcinomas on the posterior tongue and/or the posterior hard palate. 4NQO is broken down in vivo by a diaphorase, 4NQO reductase (E.C.184.108.40.206), to produce an...
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