| Namespace | MPheno.ontology | Obsolete | false |
| description | any structural anomaly of the ureteric bud cells that elongate to form a rigid structure (stalk) consisting of polarized epithelial cells without branching; the stalks differentiate into the collecting system of the mature kidney, while the tip cells interact with the adjacent cells of the metanephric mesenchyme, inducing their conversion into nephrons |
