Biopterin accumulation had been demonstrated as the result of normal and, especially, of malignant hemopoietic cell proliferation (Ziegler, I. et al. Blut, 44: 231-240, and 261-270, 1982). Among 13 major intermediates of pterin metabolism and two lumazines, xanthopterin (but not dihydroxanthopterin) was found to inhibit cell proliferation (half-maximum… (More)
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