F Osti, FG Corradini, S Hanau, M Matteuzzi, and R Gambari. 1997. “Human Leukemia K562 Cells: Induction to Erythroid Differentiation by Guanine, Guanosine and Guanine Nucleotides”. Haematologica 82 (4). Pavia, Italy, 395-401. https://doi.org/10.3324/%x.