Deuterium enrichments in chondritic macromolecular material—Implications for the origin and evolution of organics, water and asteroids

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Astrophysics with Extraterrestrial Materials (2016, background): “Thus, whether the organics are interstellar, nebular, and/or planetary in origin remains hotly debated (Alexander et al. 2010, Cody et al. 2011).”
The pH of Enceladus’ ocean (2015, background): “The presence of ferric (Fe+3) phases (e.g., magnetite, maghemite, cronstedtite) in aqueously altered chondrites (Brearley, 2006) demonstrates that this process can also occur in chondritic systems (Rosenberg et al., 2001; Alexander et al., 2010).”
Origins of building blocks of life: A review (2017, background): “CR2s are the most primitive, least altered chondrites (Cody and Alexander, 2005; Alexander et al., 2010), and typically have a higher concentration of amino acids than chondrites that experienced more severe aqueous or thermal alteration in meteorite parent bodies (Burton et al., 2012).”