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    da Costa M, Iqbal MP (1981) The transport and accumulation of methotrexate in human erythrocytes. Cancer 48:2427

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    Kamen BA, Nylen PA, Camitta BM, Bertino JR (1981) Methotrexate accumulation and folate depletion in cells as a possible mechanism of chronic toxicity to the drug. Br J Heamatol 49:355

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    Krakower GR, unpublished data

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Krakower, G.R., Kamen, B.A. & Schalhorn, A. Letter to the editor. Cancer Chemother. Pharmacol. 10, 230–231 (1983). https://doi.org/10.1007/BF00255773

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