https://www.sciencedaily.com/releases/2018/01/180109090242.htm
Independent of their identical genes, identical twins share an additional level of molecular similarity that influences their biological characteristics.
identical twinsmore thanmolecular similaritysharegenes
https://www.osti.gov/pages/biblio/1959342-neutral-loss-mass-spectral-data-enhances-molecular-similarity-analysis-mathrm-metlin
The U.S. Department of Energy's Office of Scientific and Technical Information
neutral lossmolecular similaritymassspectraldata