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Koehler MR, Wissinger B, Gorboulev V, Koepsell H, Schmid M (Jun 1998). "The two human organic cation transporter genes SLC22A1 and SLC22A2 are located on chromosome 6q26". Cytogenet Cell Genet. 79 (3–4): 198–200. doi:10.1159/000134720. PMID9605850.