SRP015831 PRJNA175622 Feces Metagenome Targeted Locus 16S amplicon pyrosequencing - human feces treated by antibiotic from patient A. human gut metagenome SRP015832 PRJNA175623 Feces Metagenome Targeted Locus 16S amplicon pyrosequencing - human feces after antibiotic treatment from patient B. human gut metagenome