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Spencer N, Hopkinson DA (1980). "Biochemical genetics of the pentose phosphate cycle: human ribose 5-phosphate isomerase (RPI) and ribulose 5-phosphate 3-epimerase (RPE)". Ann. Hum. Genet. 43 (4): 335–42. doi:10.1111/j.1469-1809.1980.tb01567.x. PMID7396409. S2CID24547339.