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Tumorigenicity of HaCaT/PDGF-B cells after s.c. injection into nude mice. Control-transfected cells (HaCaT/neo) showed no tumor growth, whereas HaCaT/PDGF-B cells (clone 17 shown as representative) developed tumors that progressed after a latency period of 6–8 weeks. Individual tumor sizes are given as the product of the two maximal diameters (mm2).
