SRR066380 HUMAN METAGENOME 700107197-PE-01 Experiment Run 1 SRX027107 HUMAN METAGENOME 700107197-PE-01 Experiment SRR066381 HUMAN METAGENOME 700107197-PE-01 Experiment Run 2 SRX027107 HUMAN METAGENOME 700107197-PE-01 Experiment quality_book_char @ quality_scoring_system log odds