The relationship between the electrophoretic mobility of double stranded DNA fragments electrophoresed in agarose gel and their molecular weights within the range from 1.10(6) to 8.10(7) daltons and agarose concentration 0.3--2.0% has been studied. Partial hydrolysis products of lambda phage DNA obtained by restriction endonuclease EcoRI have been separated. Partial hydrolysis products have been identified by determining the fragments of full cleavage as well as by genetic methods using a system of transformation of E. coli cells treated with CaCl2, which have been infected with different helper-phages containing definite gene mutations.
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