ANPEP and rhabdomyosarcoma: At the phylum level, the community from rhabdomyosarcoma-bearing APN knockout mice showed a remarkable increase in the relative abundance of Proteobacteria (p < .001), Tenericutes (p < .05), Deferribacteres, and TM7 (p < .05) and a dramatic decrease in the relative abundance of Cyanobacteria (p < 0.05) and Verrucomicrobia in comparison with those of rhabdomyosarcoma-bearing wild-type mice (Figure 3(a)).