Miriam Webster Online Dictionary: www.merriam-webster.com/dictionary/microbiome
Pelton R. Postbiotic Metabolites: What They Are and Why They Are Important. https://essentialformulas.com/postbiotic-metabolites/.
Research carried out and reported by many different scientific laboratories
Computers in Spaceflight: The NASA Experience. Chapter Two: The Apollo guidance computer: Software. https://history.nasa.gov/computers/Ch2-6.html.
Mayer E. The Mind-Gut Connection. New York, NY. Harper Collins, 2016, p. 25.
Research conducted at Human Metabolome Technology Japan, Inc.
Rosessner U, Bowne J. What is metabolomics all about? Bio Techniques Special Issue, Vol. 46, No. 5, April 2009, pp. 363–365.