Allelell酶切位点消失 GEL ELECTROPHORESIS restriction nuclease cutting sites AND SOUTHERN BLOTTING WITH LABELED PROBE DNA 3m (maternal chromosome 3) 3p (paternal chromosome 3) missing cutting site creates R尺P CUT DNA WITH 3p RESTRICTION NUCLEASE 3m 3m 3p probe detects separate DNA bands for maternal region detected and paternal homologues, by DNA probe revealing an RFLP 2020 AlleleII酶切位点消失