Some reactions of sera from normal and tumour-bearing albino rats with 2,3, 5-triphenyltetrazolium chloride.

2, from which it will be seen that there is a negative linear correlation between percentage TTC reduced and percentage tumour weight. The correlation coefficient (r) was calculated in the usual way (Moroney 1953) and found to be -0-75, rVN - 2 t test - = 5-63 (N = number of animals) -r2 highly significant at the 0- 1 per cent level.

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