
The ZymoBIOMICS™ Microbial Community Standard II (D6310) by Zymo Research is a 750 µl (10 × 75 µl) whole-cell mock community with log-distributed abundance spanning 10 organisms across six orders of magnitude — 89.1% L. monocytogenes down to 0.000089% S. aureus (~100 cells/prep). Composition independently verified; <0.01% foreign microbial DNA. For detection-limit benchmarking in 16S/metagenomics workflows.