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The single exception to this lies with the [[presolar grains]] found in primitive meteorites. These bypassed the homogenization, and often carry the nuclear signature of specific nucleosynthesis processes in which their elements were made.<ref>Ernst Zinner (1998) Stellar nucleosynthesis and the isotopic composition of presolar grains from primitive meteorites, ''Annual Review of Earth and Planetary Sciences'' '''26''':147-188.</ref> In these materials, deviations from "natural abundance" are sometimes measured in factors of 100.

 

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