IFNG and neoplasm: Although the absolute number of murine microvessels was lower in ACN/IFN-γ xenografts than in ACN/neo xenografts, their percentages were similar in both tumours (70±4 vs 69±3, three serial sections for each xenograft), indicating that the ratio between murine and human vessels (approximately 2 : 1) was unaffected by IFN-γ.