Gut microbial gene abundance and metabolic pathways associations with aGVHD. (A) Log₂ fold-changes of genes found in significantly higher amounts among those who do not develop aGVHD both pre-aHSCT and early post-aHSCT. (B) Discovery analysis of metabolic pathways found in at least 10% of samples tested at an abundance of 1000 copies per 1 million reads in pre-aHSCT and early post-aHSCT samples.