NGS Standards are mock microbial communities that mimic mixed metagenomic samples. This product comprises an even mixture of nucleic acids prepared from fully sequenced, characterized, and authenticated viral strains selected on the basis of genomic size, DNA/RNA genome, envelope/non-envelope, and other special features. Specification Range: 2x104 genome copies/μL ± 1 log* *Nucleic acid concentrations indicate ATCC manufacturing specifications and are provided as a reference only