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Histological sections of N1S1 tumour tissue from animals administered with (1a-4a) cold Biorex 70 microspheres for 1, 2, 5 and 7 days, respectively and (1b-4b) 90Y-labelled Biorex 70 microspheres for the same time intervals (Magnification 10x). Area circled in blue shows regions of greater necrotic damage in the tumour tissue.
