end marker
2.⑵By searching the Bos_Taurus_WGS_Trace database with BLASTN program, we got many Contigs for RAPD marker S139-921. Using DNAMAN 5.0 software, we jointed these Contigs and extended the RAPD fragment S139-921 from 921 bp to 2141 bp in two orientations. The left end was extended 562 bp, and the right end was extended 658 bp.

