tokens: Southern hybridizations , after digestions by restriction endonucleases , with various cloned DNAs ( D2 , 99 - 6 , B24 , C7 , L1 - 4 , cDMD13 - 14 , J66 - HI , P20 , J - Bir , ERT87 - 30 , ERT87 - 15 , ERT87 - 8 , ERT87 - 1 , XJ - 1 . 1 , 754 , cx5 . 7 , and OTC - 1 ) that are located around Xp21 also showed a deletion in the genome of all patients and mothers .