The ureide-degrading reactions of purine ring catabolism employ three amidohydrolases and one aminohydrolase in Arabidopsis, soybean, and rice.
Werner AK, Medina-Escobar N, Zulawski M, Sparkes IA, Cao FQ, Witte CP. Plant Physiol. 2013 Oct; 163(2):672-81. Epub 2013 Aug 12.