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Electrophoretic analysis of the RT–n-PCR products of the Jeryl Lynn strain and a mumps virus field strain before and after being digested with the restriction enzyme HinfI. DNA fragments from the undigested (lane A) and digested (lane B) Jeryl Lynn strain and the undigested (lane C) and digested (lane D) field strain are shown. The gel shown is a 4% agarose gel. Lanes M, DNA molecular size marker (25-bp ladder). The sizes of the bands are indicated to the left (in base pairs).
