Euclidean distance between two recipients’ preprocessed ASVs (order-level) vectors in the human-to-human cohorts before and post-FMT. The rightmost bar represents the distances between samples of the same mouse and the same donor (SDSR, samples along time), the middle bar represents the distances between samples of different mice that got FMT from the same donor (SDDR), and the leftmost bar represents the distances between samples of different mice that received FMT from different donors (DDDR), with a clear and significant hierarchy of distances. The lowest distances are the same donor/recipient, followed by the same donor, followed by different donors ((*) (p<0.05) , (**) (p<0.01) , (***) (p<0.001) ). When comparing the results before the transplant, there is no difference between the groups (before in plots F and G ).