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Immunocytochemical staining of collagen type II on cultures of chondrocytes in alginate beads two weeks after a four day period of 90Y irradiation. The figure shows the dose dependent decrease of collagen type II expression (brown staining; arrows demonstrate cells) compared with (A) the non-irradiated control; (B) 0.375 MBq; (C) 1 MBq 90Y. Bar=15.38 µm
