Examination of the basal factors interacting with the 21 bp repeat elements through electrophoretic mobility shift ( EMS ) analyses has demonstrated the formation of DNA-protein complexes common to each of the 21 bp repeats ( C1-C3 ) as well as three DNA-protein complexes specific to the promoter proximal ( pp ) repeat ( U1 ( U1A/U1B ) and U2 ; 1-4 ) .
examination of the basal factors interacting with the 21 bp repeat elements through electrophoretic mobility shift ( ems ) analyses has demonstrated the formation of dna-protein complexes common to each of the 21 bp repeats ( c1-c3 ) as well as three dna-protein complexes specific to the promoter proximal ( pp ) repeat ( u1 ( u1a/u1b ) and u2 ; 1-4 ) .
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