All animals are females sacrificed as part of an NIA grant to RW Williams to study effects of diet on aging (longevity)  in the BXD strains. A subset of females were sacrificed at specific ages for tissue harvesting and fecal pelltets from these animals were removed from the large intestine by K. Mozhui and snap frozen in liquid nitrogen prior to shipping to RTI.

Three large data sets in GeneNetwork with a common set of 4091 metabolite entries per data set (high fat, chow diet, and combined) and for as many as 18 strains.