ERX1318968 ena-EXPERIMENT-AAU, India-02-02-2016-14:16:24:996-1 Ion Torrent PGM sequencing ERP014067 ena-STUDY-AAU, India-29-01-2016-09:50:33:915-209 ERS1051178 SAMEA3864044 20161 rumen_sg WGS METAGENOMIC size fractionation Ion Torrent PGM