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Three types of codon 201 polymorphism within exon 3 of the DCC gene. Exon 3 was amplified from six primary tumors of neuroblastoma by PCR-SSCP and subjected to polyacrylamide gel electrophoresis. Three patterns of the bandshifts were noted on the electrophoresis gel and they are named as codon 201Arg type, codon 201Gly type, and codon 201Arg/Gly type according to the sequencing result.
