Fig.1 The procedure of FRGP. 1-3, restriction sites for restriction enzyme 1 (landmark enzyme), 2 and 3, respectively; A-D, restriction fragments digested with enzyme 1 and 2; a-d, the length of fragments A-D; x and y, the length of fragment C digested with enzyme 3; �� and�� adaptors for restriction sites of enzyme 1 and 2, respectively; ��, FITC.