they are carefull to give a nuetral label to there data, but are coy about it by including bio derived examples in there expanded definition, which is fair as t

they are carefull to give a nuetral label to there data, but are coy about it by including bio derived examples in there expanded definition, which is fair as the mission is to look for signs of life. macromolecular carbon (MMC) "MMC is a solid, cross-linked network of primarily reduced carbon that is resistant to chemical and thermal decomposition and is insoluble and nonlabile. MMC may have different degrees of structural order and includes aromatic and aliphatic structures that may have substituted heteroatoms or functional groups. We note that, in general, the use of the term “MMC” serves to avoid implications of biogenicity, whereas the terms “kerogen” and “bitumen” typically implicate past life or a biogenic source"